NYU has a ratio of 3 girls to 2 boys in class. If there are 12 boys in class, how many girls are there?

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Answer 1 · 2017-01-05T02:06:31

You can use a proportion to solve this problem.

So, from the problem we know 2 things:

The ratio of girls to boys is 3 to 2.

Hypothetically, there are 12 boys.

We can use a proportion to solve this problem:

$\frac{3}{2} = \frac{x}{12}$ $3/2=x/12$

And then we cross-multiply to get this:

$2 x = 36$ $2x=36$

Then, using the Division Property of Equality, we divide by 2 on both sides, resulting in the answer:

$x = 18$ $x=18$