Question
A black carton has 3 times as many marbles as a gold carton. Luke added 9 marbles to the black carton and 6 marbles to the gold carton. If there are 2 times as many marbles in the black carton as the gold carton, what was the total number of marbles in the two cartons after Luke added the marbles?
3 m

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A black carton has 3 times as many marbles as a gold carton. Luke added 9 marbles to the black carton and 6 marbles to the gold carton. If there are 2 times as many marbles in the black carton as the gold carton, what was the total number of marbles in the two cartons after Luke added the marbles?