NCERT Solutions for Class 8 Maths Exercise 2.2 Chapter 2- Linear Equations in One Variable

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NCERT Solutions for Class 8 Maths Chapter 2 Linear Equations in One Variable (EX 2.2) Exercise 2.2

On Extramarks’ website and app, students can find NCERT solutions for Class 8 for every chapter. NCERT Solutions are essential for students to study because they will help them understand the subjects. Students should keep in mind that working through NCERT textbooks can help them perform better on entrance exams like JEE, CUET, and others as well as in board exams. NCERT books can help students improve their fundamental understanding of the chapter as well as how the questions should be answered. Students can obtain assistance from NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, to understand various topics.

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Access NCERT Solutions for Maths Chapter 2 – Linear Equations in One Variable

The goal of NCERT exercises is to gauge how well students comprehend the concepts covered in a given chapter. NCERT solutions are crucial for board examinations. If students are having difficulty understanding linear equations in one variable, they should refer to the study materials for Mathematics Chapter 2 Class 8, such as the NCERT Solutions for Class 8 Maths Chapter 2 Exercise 2.2, which are available on the Extramarks website and application.  Many students find this chapter difficult and turn to the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, which offers thorough solutions.

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What You’ll Learn In NCERT Class 8 Maths Chapter 2 Exercise 2.2

Through the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, it can be concluded that this chapter begins with a brief introduction before covering a number of concepts, including how to solve equations with linear expressions on one side and numbers on the other, how to apply the aforementioned exercises, and how to solve equations with variables on both sides, equations that can be transformed into a simpler form or a linear form. The second exercise helps students put what they learned in the first exercise into practice. It provides the basis for NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Therefore, it is crucial for students to comprehend the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2 in order to achieve a higher grade.

NCERT Maths Class 8 Chapter 2 Exercise 2.2: Get Detailed Solutions

Students can understand the concepts in Exercise 2.2 by using the exact solutions and explanations provided in the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Students should remember that every NCERT exercise, including Exercise 2.2, has solutions like the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Students must fully understand the content presented in Exercise 2.2 in order to choose how to respond to various questions. When addressing problems where the query only offers scant information, they can benefit from this. Students could benefit from being aware of the various processes. To score well on exams, students must consequently absorb and retain this information. They could consult the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, if they require additional assistance. Any queries students may have regarding Exercise 13.2 can be answered by reading the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. The ideas in Exercise 2.2 are crucial for students’ exams. As a result, it is crucial for students to comprehend how certain questions should be answered because doing so can improve their academic achievement. If necessary, students must use Extramarks to assist them. For assistance for their exam, they might consult the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Hence, the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, is a helpful tool for students that they must use to improve their scores in board exams or year-end exams.

About Chapter 2 of NCERT Textbook: Linear Equations in One Variable

Chapter 2 of NCERT Class 8 Mathematics is named Linear Equations in One Variable. The NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2 will provide an overview of the chapter. This chapter contains a brief introduction to the chapter followed by various concepts such as solving equations that have linear expressions on one side and numbers on the other, some applications of the above exercise, and solving equations that have a variable on both sides. The NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, is based on the second exercise that helps students apply the things they have learned in the previous exercise. Hence, the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2 is important for students to understand in order to get a good score in the exams.

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NCERT Solutions Class 8 Maths Chapter 2 All Exercises

The topics covered in NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, include the applications of the formulas and theories learned in the first exercise. The NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2, will help students answer the questions in the exercise. Students must thoroughly study each exercise to be able to solve the next one. It will help them improve their overall performance and understanding of the concepts. Hence, students must make use of the resources provided to them in order to perform to the best of their abilities.

NCERT Solutions for Class 8

Study resources for the CBSE, ICSE, and numerous state boards are made available by Extramarks as part of its academic assistance services. For instance, Extramarks offers both Hindi and English versions of the NCERT solutions and other study materials like the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Many kids from all across the country benefit from them in order to learn and perform better. Extramarks furthermore provides NCERT solutions, study materials, and other resources for a range of classes and disciplines, including the NCERT Solutions For Class 8 Maths Chapter 2 Exercise 2.2. Extramarks provides materials for CBSE, ICSE, and other state boards to help students with their preparation and academic journey.

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Q.1

If you subtract 12 from a number and multiply the resultby 12, you get 18. What is the number?

Ans

Let the number be x. According to the question the equation becomes,(x12)×12=18On multiplying both the sides by 2,we get(x12)×12×2=18×2x12=14On transposing 12 to R.H.S, we getx=14+12x=1+24x=34

Q.2 The perimeter of a rectangular swimming pool is 154 m. Its length is 2 m more than twice its breadth. What are the length and the breadth of the pool?

Ans

The perimeter of a rectangular swimming pool is 154 m.
Let the breadth be x m. The length will be (2x + 2) m.
According to the question the equation becomes,

22x+2+x= 15423x+2= 154Dividing both sides by 2, we obtain23x+2 2=1542x+2=77On transposing 2 to R.H.S, we obtain 3x=7723x=75On dividing both sides by 3, we obtain3x3=753x=252x+2=2×25+2=52

Hence, the length and breadth of the pool are 52 m and 25 m.

Q.3

The base of an is osceles triangleis 43 cm.The perimeter of the triangle is 4215cm.What is the length of eitherof the remaining equal sides?

Ans

Let the length of equal sides be x cm.Perimeter =xcm+xcm+Base=4215cm2x+43=6215On transposing 43 to R.H.S, we obtain2x=6215432x=6220152x=4215On dividing both sides by 2, we obtain2x2=4215×2x=75Therefore, the length of equal sides is 75cm or 125.

Q.4 Sum of two numbers is 95. If one exceeds the other by 15, find the numbers.

Ans

Let one number be x.

Therefore, the other number will be x + 15.

According to the question,

x + x + 15 = 95

2x + 15 = 95

On transposing 15 to R.H.S, we obtain

2x = 95 − 15

2x = 80

On dividing both sides by 2, we get

x = 40

Therefore, x+15 = 40+15 = 55

Hence the numbers are 40 and 55.

Q.5 Two numbers are in the ratio 5:3. If they differ by 18, what are the numbers?

Ans

Let the ratio between these numbers be x.
Therefore, the numbers will be 5x and 3x respectively.
Difference between these numbers = 18
According, to the question the equation becomes
5x − 3x = 18
2x = 18

Dividing both sides by 2,we get2x2=182x=9

Therefore, the first number is 5x=5×9=45 and,
The second number is 3x=3×9=27.

Q.6 Three consecutive integers add up to 51. What are these integers?

Ans

Let three consecutive integers be x, x + 1, and x + 2.

Sum of these numbers = x+ x + 1 + x + 2 = 51

3x + 3 = 51

On transposing 3 to R.H.S, we obtain

3x = 51 − 3

3x = 48

On dividing both sides by 3,we get3x3=483x=16x+1=17x+2=18

Hence, the integers are 16, 17 and 18.

Q.7 The sum of three consecutive multiples of 8 is 888. Find the multiples.

Ans

Let the three consecutive multiples of 8 be 8x, 8(x + 1), 8(x + 2).

Sum of these numbers = 8x + 8(x + 1) + 8(x + 2) = 888

8(x + x + 1 + x + 2) = 888

8(3x + 3) = 888

On dividing both sides by 8, we get 8(3x+3) 8 = 888 8 3x+3=111 On transposing 3 to RHS,we get 3x=1113 3x=108 On dividing both sides by 3,we get 3x 3 = 108 3 x=36 MathType@MTEF@5@5@+=feaaguart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqedmvETj2BSbqefm0B1jxALjhiov2DaerbuLwBLnhiov2DGi1BTfMBaebbnrfifHhDYfgasaacH8MrFz0xbbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=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@C2DB@

Therefore, 8x = 8×36 = 288
8(x+1) = 8(36+1) = 8×37 = 296
8(x+2) = 8(36+2) = 8×38 = 304
Hence, the numbers are 288,296 and 304.

Q.8 Three consecutive integers are such that when they are taken in increasing order and multiplied by 2, 3 and 4 respectively, they add up to 74. Find these numbers.

Ans

Let three consecutive integers be x, x + 1, x + 2. According to the question,

2x + 3(x + 1) + 4(x + 2) = 74

2x + 3x + 3 + 4x + 8 = 74

9x + 11 = 74

On transposing 11 to R.H.S, we obtain

9x = 74 − 11

9x = 63

On dividing both sides by 9,we get 9x 9 = 63 9 x=7 x+1=8 x+2=9 Hence,the numbers are 7, 8 and 9. MathType@MTEF@5@5@+=feaaguart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqedmvETj2BSbqefm0B1jxALjhiov2DaerbuLwBLnhiov2DGi1BTfMBaebbnrfifHhDYfgasaacH8MrFz0xbbf9q8WrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfea0=yr0RYxir=Jbba9q8aq0=yq=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@8932@

Q.9 The ages of Rahul and Haroon are in the ratio 5:7. Four years later the sum of their ages will be 56 years. What are their present ages?

Ans

Let the ratio between Rahul’s age and Haroon’s age be x.

Therefore, the age of Rahul and Haroon will be 5x years and 7x years.

Four years later, the age of Rahul and Haroon will be (5x + 4) years and (7x + 4) years.

According to the given question, the equation becomes,

(5x + 4 + 7x + 4) = 56

12x + 8 = 56

On transposing 8 to R.H.S, we obtain

12x = 56 − 8

12x = 48

On dividing both sides by 12,we get12x12=4812x=4Rahuls age=5x=5×4=20yearsHaroons age is=7x years=7×4=28 years

Q.10 The number of boys and girls in a class are in the ratio 7:5. The number of boys is 8 more than the number of girls. What is the total class strength?

Ans

Let the ratio between the number of boys and numbers of girls be x.

Then, number of boys = 7x

Number of girls = 5x

According to the given question,

Number of boys = Number of girls + 8

7x = 5x + 8

On transposing 5x to L.H.S, we obtain

7x − 5x = 8

2x = 8

On dividing both sides by 2,we get2x2=82x=4Number of boys=7x=7×4=28 Number of girls=x=5×4=20 Hence,the total strength of class= 28+20=48 students

Q.11 Baichung’s father is 26 years younger than Baichung’s grandfather and 29 years older than Baichung. The sum of the ages of all the three is 135 years. What is the age of each one of them?

Ans

Let Baichung’s father’s age be x years.

Therefore, Baichung’s age will be (x − 29) years and Baichung’s grandfather’s age will be (x + 26) years.

According to the given question, the equation becomes:

x + x − 29 + x + 26 = 135

3x − 3 = 135

On transposing 3 to R.H.S, we obtain

3x = 135 + 3

3x = 138

On dividing both sides by 3,we get3x3=1383x=46 Baichungs fathers age =x years=46 years Baichungs age =(x29) years=(4629)=17 years Baichungs grandfathers age =(x+26) years=(46+26)years=72 years

Q.12 Fifteen years from now Ravi’s age will be four times his present age. What is Ravi’s present age?

Ans

Let Ravi’s present age be x years.

Fifteen years later, Ravi’s age = 4 × His present age

x + 15 = 4x

On transposing x to R.H.S, we obtain

15 = 4xx

15 = 3x

On dividing both sides by 3,we get153=3x3x=5 Ravis present age =5 years

Q.13

A rational number is such that when you multiply it by 52and add 23 to the product, you get 712. What is the number ?

Ans

Let the number be x.According to the question,the equation becomes52x+23=712On transposing 23 to R.H.S, we get52x=7122352x=781252x=1512On multiplying both sides by25, we get5x2×25=1512×25x=12Hence, the number is 12.

Q.14 Lakshmi is a cashier in a bank. She has currency notes of denominations ₹ 100, ₹ 50 and ₹ 10, respectively. The ratio of the number of these notes is 2:3:5. The total cash with Lakshmi is ₹ 4,00,000. How many notes of each denomination does she have?

Ans

Let the ratio between the numbers of notes of different denominations be x.

Therefore, numbers of ₹ 100 notes, ₹ 50 notes, and ₹ 10 notes will be 2x, 3x, and 5x respectively.

Amount of ₹ 100 notes = ₹ (100×2x) = ₹ 200x

Amount of ₹ 50 notes = ₹ (50×3x) = ₹ 150x

Amount of ₹ 10 notes = ₹ (10×5x) = ₹ 50x

Total cash = ₹ 400000.

Therefore,

200x + 150x + 50x = 400000

⇒ 400x = 400000

On dividing both sides by 400, we obtain

x = 1000

Therefore,

Number of ₹ 100 notes = 2x = 2 × 1000 = 2000 notes

Number of ₹ 50 notes = 3x = 3 × 1000 = 3000 notes

Number of ₹ 10 notes = 5x = 5 × 1000 = 5000 notes

Q.15 I have a total of ₹ 300 in coins of denomination ₹ 1, ₹ 2 and ₹ 5. The number of Rs 2 coins is 3 times the number of ₹ 5 coins. The total number of coins is 160. How many coins of each denomination are with me?

Ans

Let the number of ₹ 5 coins be x.

Since the number of ₹ 2 coins is 3 times the number of ₹ 5 coins, so the number of ₹ 2 coins = 3x

Therefore, the number of ₹1 coins = 160 − (Number of coins of ₹ 5 and of ₹ 2)

= 160 − (3x + x) = 160 − 4x

Now, Amount of ₹ 1 coins = ₹ [1 × (160 − 4x)] = ₹ (160 − 4x)

Amount of ₹ 2 coins = ₹ (2 × 3x) = ₹ 6x

Amount of ₹ 5 coins = ₹ (5 × x) = ₹ 5x

Total amount is ₹300.

Therefore, 160 − 4x + 6x + 5x =300

160 + 7x = 300

On transposing 160 to R.H.S., we obtain

7x = 300 – 160 = 140

On dividing both sides by 7, we get

x = 20No. of ₹ 1 coins = 160 – 4x = 160 – 4×20 = 80

No. of ₹ 2 coins = 3x = 3×20 = 60

No. of ₹ 5 coins = x = 20

Therefore, number of ₹ 1 coins is 80, ₹ 2 coins is 60 and ₹ 5 coins is 20.

Q.16 The organisers of an essay competition decide that a winner of the competition gets a prize of ₹ 100 and a participant who does not win gets a prize of ₹ 25. The total prize money distributed is ₹ 3,000. Find the number of winners, if the total number of participants is 63.

Ans

Let the number of winners be x.

Therefore, the number of participants who did not win will be 63 − x.

Amount given to the winners = ₹ (100 × x) = ₹ 100x

Amount given to the participants who did not win = ₹ [25(63 − x)]

= ₹ (1575 − 25x)

According to the given question,

100x + 1575 − 25x = 3000

On transposing 1575 to R.H.S, we obtain

75x = 3000 − 1575

75x = 1425

On dividing both sides by 75, we obtain75x75=142575x=19Hence, the number of winners=19

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