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MATH / I have a bag with yellow and blue marbles in it. At the moment, the ratio of…

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problem

I have a bag with yellow and blue marbles in it. At the moment, the ratio of blue marbles to yellow marbles is 4:3. If I add 5 blue marbles and remove 3 yellow marbles, the ratio will be 7:3. How many blue marbles were in the bag before I added more?

level

Level 3

type

Algebra

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