GIVEN : Number of Males = 150 Number of Females = 100 Total number of Child = 30 CONCEPT : Percentage CALCULATION : According to the question 150 × x% + 100 × x% = 30 150 ×
x
100
+ 100×
x
100
= 30 x = 12 Number of child included in females = 100 × 12% = 12 ∴ Required number of females = 100 - 12 = 88