Posted by Mercedez on .
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 
Ms. Sue,
I'd set up a proportion (ratio).
5/12 = b/48
12b = 240
b = 20 
7th grade math 
Mercedez,
Where did you get the 5/12 from when it's 5/7?

7th grade math 
Ms. Sue,
You're comparing the number of boys with the total.
5 + 7 = 12 
7th grade math 
Anonymous,
A school has 1800 students on its roll 40% of whom are girls how many boys are there in the school

7th grade math 
Blue,
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?