Question 307879
there are 730 pupils in a school the ratio of boys to girl is 5:7 

calculate the number of boys in the school 

I will just edit the sum . Assume number of pupils to be 732

The ratio of boys to girls = 5/7

THERE ARE 12 PARTS IN THE RATIO. 

out of which 5 parts are boys

5/12 * 732 
= 5*61
= 305 boys