Question
There were some pencils in Packet X and Packet Y. After Carl transferred 13 of the pencils from Packet X to Packet Y, the ratio of the number of pencils in Packet X to that in Packet Y changed to 1 : 9. Find the ratio of the numbers of pencils in Packet Y to the number of pencils in Packet X at first.
3 m

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There were some pencils in Packet X and Packet Y. After Carl transferred 13 of the pencils from Packet X to Packet Y, the ratio of the number of pencils in Packet X to that in Packet Y changed to 1 : 9. Find the ratio of the numbers of pencils in Packet Y to the number of pencils in Packet X at first.