Question

The ratio of girls to boys who participated in the quiz bowl was 7:5. There were 42 girls in the competition. How many boys participated?

A)
28

B)
30

C)
35

D)
49

Answer 1

@Michele_Laino

Answer 2

our proportion is:
\[\frac{ 7 }{ 5 }=\frac{ 42 }{ x }\]
where x is the number of boys.

Answer 3

So:
\[7:5=42:x\]
and applying the fundamental property of proportion, we have:

Answer 4

so the answer is....

Answer 5

lol

Answer 6

\[210=7*x\]
x=30
so B.

Answer 7

thankyou so much @Michele_Laino

Answer 8

thank you! @muneeb180