Alex determines that there are 5 chocolate candies per cubic inch. If there are 150 chocolate candies in a jar, what is the volume of the jar?

The answer is 30 cubic inches.

If 5 chocolate candies are in 1 cubic inch, 150 chocolate candies will be in x cubic inches:

5 chocolate candies : 1 cubic inch = 150 chocolate candies : x cubic inches

5 : 1 = 150 : x

5 = 150 : x

x = 150 : 5

x = 30

So, if 150 chocolate candies are in a jar, the volume of the jar is 30 cubic inches.