Question

in a school 0.8 part of the strength of the school is boys and the number of girls is 150 find the number of the boys in the school

Answer 1

let total no. of student be x
so,
no. of girls =
.2 x = 150
x = 750

no. of boys = 750 - 150
= 600

Answer 2

Let the total number of students be x:

Part that are boys = 0.8x

Part that are girls = x - 0.8x = 0.2x

Given that there are 150 girls

0.2 x = 150

0.1x = 150 ÷ 2

0.1x = 75

Find the number of boys:

0.8 = 75 x 8 = 600 boys

Answer: There are 600 boys