Question

A class has the same number of girls and boys. Only eight boys were absent on a particular day and then the number of girls was double the number of girls. What is the number of boys and girls?

Answer 1

Let the number of boys in the class be x and the number of girls in the class be y.

since both the number of girls and the number of boys are equal,

x = y

When 8 boys are absent ,

the number of boys = x - 8

y = 2(x - 8)

Since x = y

y = 2(y - 8)
y = 2y - 16
y =16

Therefore the number of boys and the number of girls are equal to 16 each.