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

@iambatman

Answer 2

@iGreen.

Answer 3

You can set up a proportion:

\(\dfrac{7}{5} = \dfrac{42}{x}\)

Cross multiply:

\(7 \times x = 7x\)

\(5 \times 42 = 210\)

\(7x = 210\)

Now solve for x.

Divide 7 to both sideds, what's 210 / 7?

Answer 4

30 :)

Answer 5

Yep, so that's your answer.

Answer 6

Check:

7 / 5 = 1.4

42 / 30 = 1.4

So 30 is your answer.

Answer 7

Thank you!!!:)

Answer 8

No problem :D