Question

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

The probability of randomly choosing a red marble is
7/10th


There are 42 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

60 marbles in total

Explanation:

Find how many marbles there are in total by dividing 42 by 0.7:

42/0.7

= 60

So, there are 60 marbles in total