Question
There were some cards in Packet M and Packet N. After Flynn transferred 14 of the cards from Packet M to Packet N, the ratio of the number of cards in Packet M to that in Packet N changed to 2 : 7. Find the ratio of the numbers of cards in Packet M to the number of cards in Packet N at first.
3 m

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There were some cards in Packet M and Packet N. After Flynn transferred 14 of the cards from Packet M to Packet N, the ratio of the number of cards in Packet M to that in Packet N changed to 2 : 7. Find the ratio of the numbers of cards in Packet M to the number of cards in Packet N at first.