Question

A bag contains 10 black, 15 white, and 25 blue marbles. What is the probability of randomly selecting one

marble that is NOT black?

Answer 1

Answer: 0.8 or 80%

Explanation:

First find the total number of marbles:

10 + 15 + 25 = 50 marbles total

To find the number of marbles that are not black:

15 + 25 = 40 marbles that are not black

Set up ratio:

`(40)/(50)` = 0.8 or 80%