AMC 10 Step by Step
2008 AMC 10AProblem 12P11-15~2 minPrint

In a collection of red, blue, and green marbles, there are 25%25\% more red marbles than blue marbles, and there are 60%60\% more green marbles than red marbles. Suppose that there are rr red marbles. What is the total number of marbles in the collection?

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Problem © Mathematical Association of America (MAA), American Mathematics Competitions. Reproduced for non-commercial educational use. Solution and commentary are original to this site.