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ratio of blue marbles to red marbles is11:9 if there are 99 blue marbles how many red marbles

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2 Answers

11     99     <-- Blue Marbles--  = --9      x      <-- Red Marbles

You can cross multiply to solve for x.

11*x = 99*9

11x = 891

11/11 x = 891/11

x = 81

So if there are 99 blue marbles, to maintain the ratio, there must also be 81 red marbles.