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I have a bag with blue marbles and yellow marbles in it. At the moment, the ratio of blue marbles to yellow marbles is 8:5. If I remove 30 blue marbles and add 5 yellow marbles, the ratio will be 1:3. How many blue marbles were in the bag before I removed some?

 Nov 16, 2020
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(8/13 x -30) / (5/13 x+5)  = 1/3

24/13 x - 90 = 5/13x+5

x = 65    original marbles of which 8/13 were blue =40 blues

 Nov 16, 2020

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