Question
There were some erasers in Bag P and Bag Q. After Harry transferred 13 of the erasers from Bag P to Bag Q, the ratio of the number of erasers in Bag P to that in Bag Q changed to 3 : 5. Find the ratio of the numbers of erasers in Bag Q to the number of erasers in Bag P at first.
3 m

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There were some erasers in Bag P and Bag Q. After Harry transferred 13 of the erasers from Bag P to Bag Q, the ratio of the number of erasers in Bag P to that in Bag Q changed to 3 : 5. Find the ratio of the numbers of erasers in Bag Q to the number of erasers in Bag P at first.