The ratio of blue to marbles to red marbles in a box is 2 to 1 . if there are 12 blue marbles in the box then how many blue & red marbles are there in total

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❖ There are a total of 18 marbles.

In order to get 18, we have the ratio 2:1. 2 represents the blue marbles and 1 represents the red marbles. We now have 12 blue marbles in a box. 2 x 6 = 12 so we are multiplying by 6. What we do to one number, we do to the other so 1 x 6 = 6 . Add 12 + 6 = 18

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step-by-step explanation: