Mathematics: There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is 7/12 There are 84 marbles in total in the bag and each is equally likely to be chosen. Work out how many red marbles there must be.

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

gesic2003

06.07.2021

Step-by-step explanation:

The probability of choosing a red marble is equal to the number of red marbles over the number of total marbles there are.

Therefore, let the number of red marbles be .

We have the following equation:

$\frac{x}{84}=\frac{7}{12}$

Cross-multiplying, we get:

$12x=7\cdot 84,\\x=\frac{84\cdot 7}{12},\\x=\boxed{49}$

Therefore, there are 49 red marbles in the bag.

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twinky5

14.08.2021

h=24

Step-by-step explanation:

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