Question
There were some erasers in Packet T and Packet U. After Cole transferred 15 of the erasers from Packet T to Packet U, the ratio of the number of erasers in Packet T to that in Packet U changed to 3 : 5. Find the ratio of the numbers of erasers in Packet T to the number of erasers in Packet U at first.
3 m

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There were some erasers in Packet T and Packet U. After Cole transferred 15 of the erasers from Packet T to Packet U, the ratio of the number of erasers in Packet T to that in Packet U changed to 3 : 5. Find the ratio of the numbers of erasers in Packet T to the number of erasers in Packet U at first.