Question
There were some coins in Packet M and Packet N. After Vincent transferred 25 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 1 : 8. Find the ratio of the numbers of coins in Packet N to the number of coins in Packet M at first.
3 m

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There were some coins in Packet M and Packet N. After Vincent transferred 25 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 1 : 8. Find the ratio of the numbers of coins in Packet N to the number of coins in Packet M at first.