Question

The ratio of A's to B's on the last test was 3 to 4. If there was 12 A's . how maby B's were there?​

Answer 1

a - 3
b - 4

3 x ? = 12
? = 4

so

4 x 4 = 16

ANSWER 16

Answer 2

16 B's

Explanation:

If you know there are 3/4 A's/B's,

and that there are 12 A's,

you can set up a proportion:

3 12

-- = --

4 x

cross multiplication gets you:

48 = 3x

solve for x.

x = 16