There are 3 boys for every 4 girls in school. If there are 200 girls, how many pupils are there in all? Help me please. This is my homework and I need it right now because we have a class for tomorrow.

Answer 1

Let the number of boys be 3x
let the number of girls be 4x
( notice 3x : 4x = 3 : 4 )

given : 4x = 200
x = 50

So we have 150 boys and 200 girls, for a total of 350.

( notice 150:200 = 3:4 , as required)