There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 2 9 . There are 63 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

The main idea is the number of marbles and the denominator of the probability. All you have to do is multiply the fraction by a fraction which is equal to 1 which makes the denominator equal to 63. We know 63 is a multiple of 9. 9 goes 7 times in 63 so we multiple the fraction with which gives, which when evaluated gives and the numerator is the number of red marbles in the bag. So there are 14 red marbles in the bag :D

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step-by-step explanation:

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