Question
There were some coins in Packet M and Packet N. After Archie transferred 15 of the coins from Packet M to Packet N, the ratio of the number of coins in Packet M to that in Packet N changed to 2 : 5. Find the ratio of the numbers of coins in Packet M to the number of coins in Packet N at first.
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There were some coins in Packet M and Packet N. After Archie transferred 15 of the coins from Packet M to Packet N, the ratio of the number of coins in Packet M to that in Packet N changed to 2 : 5. Find the ratio of the numbers of coins in Packet M to the number of coins in Packet N at first.