1.

In a class, there are 18 very tall boys. If these constitute three-fourths of the boys and the total number of boys is two-thirds of the total number of students in the class, what is the number of girls in the class?1. 62. 123. 184. 21

Answer» Correct Answer - Option 2 : 12

Given 

No. of boys who are very tall = 18

Calculation 

Let the number of boys be x. 

⇒ (3/4)x = 18 

⇒ x = 18 × (4/3) = 24.

⇒ If total number of students is y,

⇒ (2/3) y = 24

⇒  y = 24 x (3/2) = 36.

⇒ Number of girls in the class = (36 - 24) = 12.

∴ The number of girls in the class is 12.



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