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16 June, 15:54

There is a bag with only red marbles and blue marbles. The probability of randomly choosing a blue 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.

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  1. 16 June, 19:19
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    40

    Step-by-step explanation:

    Since the probability to choose a blue marble is 1/9, there must be 5 blue marbles since 45 * 1/9 = 5

    Subtract 5 from 45 to get 40, since the rest of the marbles are red.
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