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06-09-2020
Mathematics

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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.

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06-09-2020

Answer:

40

Step-by-step explanation:

Let x = total number of marbles

p(red) = (number of red marbles)/(total number of marbles)

3/10 = 12/x

3x = 120

x = 40

Answer: The total number of marbles is 40

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