In a class there are 18 very tall boys If these constitute three fourths of the boys and the total n...........

Math and Mental Ability Simplification

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?

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Explanation:

Let number of girls in the class be X
Number of boys in the class will be 2X (2/3 being boys, total being X + 2X = 3X)
Number of very tall boys = 3/4 * 2X = 18
So X = 12.