Proportion
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Q1
If 10 bananas costs Rs 20, find the cost of 7 bananas.
Marks:2Answer:
Cost of 10 bananas = Rs 20
Cost of 1 banana = Rs 20/10 = Rs 2
Cost of 7 bananas = Rs 7 2 = Rs 14 
Q2
If we divide Rs 20 between Jatin and Arnav in the ratio 3 : 2, how much will each of them get?
Marks:2Answer:
Sum of the two terms of the ratio (3 : 2) = 3 + 2
= 5
Jatin's share = (3/5) 20
= Rs 12
Arnav's share = (2/5) 20
= Rs 8 
Q3
In a school of 1800 students, 600 are girls. Find the ratio of boys to the total number of students.
Marks:2Answer:
Total no. of students in the school = 1800
Total no. of girls = 600
Total no. of boys = 1800 – 600 = 1200
Required ratio = 1200 : 1800 = 2 : 3 
Q4
The length, breadth and height of a building is 200 m, 175 m and 150 m respectively. Find the ratio of
(i) length: breadth
(ii) length: heightMarks:2Answer:
Length of the building = 200 m
Breadth of the building = 175 m
Height of the building = 150 m

Q5
A company manufactures 1000 bulbs per month on an average. It was found out that 50 bulbs were defective in a certain month. Find out the ratio of defective bulbs to the number of bulbs produced.
Marks:2Answer:
No. of defective bulbs = 50
No. of total bulbs = 1000
Required ratio = 50 : 1000
= 1 : 20.