# 7th grade math

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There are 48 students in a school play. The ratio of boys to girls is 5:7. How many boys are in the school play? Explain how you found your answer.

• 7th grade math -

I'd set up a proportion (ratio).

5/12 = b/48

12b = 240

b = 20

• 7th grade math -

Where did you get the 5/12 from when it's 5/7?

• 7th grade math -

You're comparing the number of boys with the total.

5 + 7 = 12

• 7th grade math -

A school has 1800 students on its roll 40% of whom are girls how many boys are there in the school

• 7th grade math -

on the question above the one with no answer i got that answer but my teacher says it is wrong who is right and how did you get this answer?

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