Question
Shiyun had five times as many marbles as Lucy. After Lucy bought another 72 marbles, Lucy had 2 times as many marbles as Shiyun. How many marbles did Shiyun have?
4 m

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Shiyun had five times as many marbles as Lucy. After Lucy bought another 72 marbles, Lucy had 2 times as many marbles as Shiyun. How many marbles did Shiyun have?