Question
There were some erasers in Bag T and Bag U. After Riordan transferred 25 of the erasers from Bag T to Bag U, the ratio of the number of erasers in Bag T to that in Bag U changed to 2 : 5. Find the ratio of the numbers of erasers in Bag U to the number of erasers in Bag T at first.
3 m

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There were some erasers in Bag T and Bag U. After Riordan transferred 25 of the erasers from Bag T to Bag U, the ratio of the number of erasers in Bag T to that in Bag U changed to 2 : 5. Find the ratio of the numbers of erasers in Bag U to the number of erasers in Bag T at first.