Question
Tammy had twice as many marbles as Gem. After Gem bought another 84 marbles, Gem had 4 times as many marbles as Tammy. How many marbles did Tammy have?
4 m

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Tammy had twice as many marbles as Gem. After Gem bought another 84 marbles, Gem had 4 times as many marbles as Tammy. How many marbles did Tammy have?