1. In a class, there are 18 boys who are over 160 cm tall. 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 ?

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By: guest on 02 Jun 2017 02.07 am

Let the number of boys be x. Then, (3/4)x = 18 or x = 18 x(4/3) = 24.If total number of students is y, then (2/3) y = 24 or y = 24 x (3/2) = 36.Therefore Number of girls in the class = (36 - 24) = 12.