Answer:
A
Step-by-step explanation:
Answer:
or 
Step-by-step explanation:
The volume of a cylinder can be found with the following formula:

Where "r" is the radius and "h" is the height of the cylinder.
In this case, let be:
-
the volume of one of this cylinders and
the volume of the other one.
-
the radius of the first one and
the radius of the other cylinder.
-
the height of one of them and
the height of the other cylinder.
Then:

Therefore, you know this:

Simplifying, you get:

Now, knowing the ratios given in the exercise, you can substitute them into the equation:

Evaluating, you get:

It would be 12 ones it would be this because you have to add 7+ 5
8 - 8x is already in its simplest form.
Without knowing the value of x, you cannot find what is equivalent to 8 - 8x, but you can it if is an equation, such as 8 - 8x = 88 (x would be -10).
However, you can still rewrite it as -8x + 8, which is equivalent to 8 - 8x.