In a school, the ratio of number of boys to number of girls is 3:2. If

SOLUTION

Let the number of girls decreases by x%.

The ratio of number of boys to number of girls = 3:2 = 15:10

7.5% – 5% = x%

⇒ x% = 2.5%

According to the question,

2.5% = 250

1% = 100

100% = 10000

Hence, total number of girls = 10000

The ratio of number of boys to number of girls is 3:2

2 unit = 10000

⇒ 1 unit = 5000

⇒ 3 unit = 15000

Thus, the initial number of boys in school was 15000.