Question
There were some erasers in Bag W and Bag X. After Neave transferred 15 of the erasers from Bag W to Bag X, the ratio of the number of erasers in Bag W to that in Bag X changed to 3 : 4. Find the ratio of the numbers of erasers in Bag W to the number of erasers in Bag X at first.
3 m

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There were some erasers in Bag W and Bag X. After Neave transferred 15 of the erasers from Bag W to Bag X, the ratio of the number of erasers in Bag W to that in Bag X changed to 3 : 4. Find the ratio of the numbers of erasers in Bag W to the number of erasers in Bag X at first.