Question
Tiffany has four times as many marbles as Sarah. After Sarah has bought another 84 marbles, Sarah has twice as many marbles as Tiffany. How many marbles does Sarah have at first?
4 m

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Tiffany has four times as many marbles as Sarah. After Sarah has bought another 84 marbles, Sarah has twice as many marbles as Tiffany. How many marbles does Sarah have at first?