Question
Shiyun had twice as many marbles as Shannon. After Shannon bought another 80 marbles, Shannon had 3 times as many marbles as Shiyun. How many marbles did Shiyun have?
4 m

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Shiyun had twice as many marbles as Shannon. After Shannon bought another 80 marbles, Shannon had 3 times as many marbles as Shiyun. How many marbles did Shiyun have?