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Percentage (Exercise 11.2) RD Sharma Solutions | Mathematics (Maths) Class 7 PDF Download

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1. Express each of the following ratios as per cents: 
(i) 4: 5 
(ii) 1: 5 
(iii) 11: 125 
 
Solution: 
(i) Given 4: 5 
4: 5 can be written as (4/5) 
= (4/5) × 100 
= 80% 
 
(ii) Given 1: 5 
1: 5 can be written as (1/5) 
= (1/5) × 100 
= 20% 
 
(iii) Given 11: 125 
11: 125 can be written as (11/125) 
= (11/125) × 100 
= (44/5) % 
 
2. Express each of the following percents as ratios in the simplest form: 
(i) 2.5% 
(ii) 0.4% 
(iii) 13 3/4 % 
 
Solution: 
(i) Given 2.5% 
= (2.5/100) 
= (25/1000) 
= (1/40) 
 
(ii) Given 0.4% 
= (0.4/100) 
Page 2


 
 
 
 
 
 
 
         
 
1. Express each of the following ratios as per cents: 
(i) 4: 5 
(ii) 1: 5 
(iii) 11: 125 
 
Solution: 
(i) Given 4: 5 
4: 5 can be written as (4/5) 
= (4/5) × 100 
= 80% 
 
(ii) Given 1: 5 
1: 5 can be written as (1/5) 
= (1/5) × 100 
= 20% 
 
(iii) Given 11: 125 
11: 125 can be written as (11/125) 
= (11/125) × 100 
= (44/5) % 
 
2. Express each of the following percents as ratios in the simplest form: 
(i) 2.5% 
(ii) 0.4% 
(iii) 13 3/4 % 
 
Solution: 
(i) Given 2.5% 
= (2.5/100) 
= (25/1000) 
= (1/40) 
 
(ii) Given 0.4% 
= (0.4/100) 
 
 
 
 
 
 
 
= (4/1000) 
= (1/250) 
 
(iii) Given 13 3/4 % 
13 3/4 = 13.75 
= 13.75/100 
= 1375/10000 
= 11/80 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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