Question
Pamela has thrice as many marbles as Rachel. After Rachel has bought another 72 marbles, Rachel has thrice as many marbles as Pamela. How many marbles does Rachel have at first?
4 m

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Pamela has thrice as many marbles as Rachel. After Rachel has bought another 72 marbles, Rachel has thrice as many marbles as Pamela. How many marbles does Rachel have at first?