Question

The ratio of boys to girls in a choir is 3 to 6. There are 30 girls in the choir.

How many members are in the choir?

Answer 1

45 members

Explanation:

`(3)/(6) :(y)/(30)`

y · 6 = 3 · 30

6y = 90

6y ÷ 6 = 90 ÷ 6

y = 15

30 + 15 = 45

Answer 2

45 members are in the choir.

Explanation:

Set up an equation:

Variable x = boys

3/6 = x/30

Cross multiply:

3 × 30 = 6 × x

90 = 6x

Divide both sides by 6:

15 = x

There are 15 boys.

To find the number of members in the choir, add the number of boys and girls:

30 + 15 = 45