Question

There is a bag with only red marbles and blue marbles.

The probability of randomly choosing a red marble is 1/9
There are 45 marbles in total in the bag and each is equally likely to be chosen.
Work out how many red marbles there must be.

Answer 1

5 red marbles.

Explanation:

(1/9) * 45 = 45 /9 = 5.