Question
Marbles are sold in boxes of 6.
During a sale, 3 extra marbles are given free for every box sold.
Adam has 72 marbles in the end.
How many boxes of marbles does he get?
4 m

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Marbles are sold in boxes of 6.
During a sale, 3 extra marbles are given free for every box sold.
Adam has 72 marbles in the end.
How many boxes of marbles does he get?