Question
A black box has 4 times as many marbles as a grey box. Pierre added 6 marbles to the black box and 12 marbles to the grey box. If there are 3 times as many marbles in the black box as the grey box, what was the total number of marbles in the two boxes after Pierre added the marbles?
3 m

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A black box has 4 times as many marbles as a grey box. Pierre added 6 marbles to the black box and 12 marbles to the grey box. If there are 3 times as many marbles in the black box as the grey box, what was the total number of marbles in the two boxes after Pierre added the marbles?