Class 7 Exam > Class 7 Notes > Mathematics (Maths) Class 7 > RD Sharma Solutions: Percentage (Exercise 11.2)
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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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