The volume of a cube is found by:
1. l x w x h
2. l x w
3. w x h

1)

Step-by-step explanation:

l x w and w x h are all formula for a rectangle, not a cube.

For instance, let's take l x w. If we change the height it will definitely change the volume, but according to 2) it won't. So, 2 is wrong.

We can do the same process for 3) to show it's wrong.

So, the answer is not 2) or 3), so it must be

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls