Proportion

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• Q1

If 10 bananas costs Rs 20, find the cost of 7 bananas.

Marks:2

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:2

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:2

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
(ii) length: height

Marks:2

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:2