A cotton candy vendor has 10 cones of blue cotton candy to sell. If the blue cotton candy is 25% of the total number of cones, how many total cotton candy cones does he have?

Answer: 40 cones

Explanation: If the blue cones (of which there are 10) are 25% or one quarter of the total number of cones, that means that the total number is equal to four times that, or 40.

10 = 25%
total = 100%
25% x 4 = 100%
10 x 4 = 40