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- The ratio of number of boys and girls in a school of 720 students is 7:5.
Question 1:
The ratio of number of boys and girls in a school of 720 students is 7:5.How many more girls should be admitted to make the ratio 1:1?
A. 220
B. 230
C. 120
Feedback Given, boys : girls = 7 : 5
Let, the total number of boys = 7x and total number of girls= 5x
Given, total students = 720
=> 7x + 5x = 720
=> 12x = 720
=> x = 60
so, total number of boys = 7x = 7 * 60 = 420 and
total number of girls= 5x = 5 * 60 = 300
Let y be the number of girls added to make the ratio 1 : 1
=> 420 / (300 + y) = 1/1
=> 420 = (300 + y)
=> y = 420 - 300
=> y = 120
So, 120 more girls should be admitted to make the ratio 1:1
Let, the total number of boys = 7x and total number of girls= 5x
Given, total students = 720
=> 7x + 5x = 720
=> 12x = 720
=> x = 60
so, total number of boys = 7x = 7 * 60 = 420 and
total number of girls= 5x = 5 * 60 = 300
Let y be the number of girls added to make the ratio 1 : 1
=> 420 / (300 + y) = 1/1
=> 420 = (300 + y)
=> y = 420 - 300
=> y = 120
So, 120 more girls should be admitted to make the ratio 1:1
D. 121
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