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# probability

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There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 3/10. There are 12 red marbles in the bag and each is equally likely to be chosen. Work out how many marbles in total there must be.

Sep 6, 2020

There is a possibility of $$\frac{3}{10}$$to get a red marble and there are 12 red marbles. This is the same as saying $$\frac{3}{10}$$of all the marbles is twelve. Therefore, the total number of marbles are 12 divided by 3 time by 10 which is 40 marbles.