A sack contains red and blue marbles. The ratio of red marbles to blue marbles is 4:3. If there are 18 blue marbles in the sack, how many red marbles are in the sack?
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R/B = 4/3 => R = 4 B/ 3
B = 18
R = 4*18/3 = 24
B = 18
R = 4*18/3 = 24
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