Question

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 3 8 . There are 18 red marbles in the bag and each is equally likely to be chosen. Work out how many marbles in total there must be.

Answer 1

There are 48 marbles in the bag

Explanation:

red: blue : total

3 8

there are 18 red

18/3 = 6

Multiply everything by 6

3*6 8*6

18 48

There are 48 marbles in the bag