Question

A container has 1 pink block and 3 green blocks. Juan wants to make the probability of randomly selecting a black block equal to 50%. How many black blocks should he add?

Answer 1

4

Explanation:

He should add 4 black blocks because there are a total of 4 other blocks, and in order to have a probability of 50%, the number of black blocks needs to be equal to the total number of the other colored blocks.