Question

A box contains 12 red marbles, 15 black marbles and 18 green marbles. One marble is picked up from the box randomly. What is the probability of getting a red or a black marble?

Answer 1

12 + 15 + 18 = 45 marbles in total
12 + 15 = 27 red/black marbles

`(27)/(45)` is the probability
Also 60%
Hope this helped :)

Answer 2

I believe the answer is 27/45, or 60%.