Question

The average height of group of pupils is 144 cm .if 3/5 of people are boys and their average height is 156 cm.find the average height of the girls?

Answer 1

Step-by-step explanation:

The average height of group of pupils is 144cm

3/5 of people are boys and their avg height 156

then we have to find avg height of the girls

3/5*156+x=144

9+x=144

x=135

therefore the avg height of the girls is 135..

hope u it helps...