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

The probability of randomly choosing a blue marble is

11/12

There are 72 marbles in total in the bag and each is equally likely to be chosen.

Work out how many red marbles there must be.

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# There is a bag with only red marbles and blue marbles.
The probability of randomly choosing a blue marble is
11/12
There

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

The probability of randomly choosing a blue marble is

11/12

There are 72 marbles in total in the bag and each is equally likely to be chosen.

Work out how many red marbles there must be.