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How to Solve a Word Problem: How Many Marbles in the Jar?
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The problem: A marble jar has red, blue, yellow, and green marbles. There are twice as many blue marbles as red marbles. There are 15 more yellow marbles than red marbles. There are 20 less green marbles than red marbles. If there are 100 marbles in the jar, how many or each color are there?
The solution: 21 red marbles, 42 blue marbles, 36 yellow marbles, and 1 green marble.
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