Question
There were some cards in Box U and Box V. After Seth transferred 13 of the cards from Box U to Box V, the ratio of the number of cards in Box U to that in Box V changed to 3 : 8. Find the ratio of the numbers of cards in Box V to the number of cards in Box U at first.
3 m

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There were some cards in Box U and Box V. After Seth transferred 13 of the cards from Box U to Box V, the ratio of the number of cards in Box U to that in Box V changed to 3 : 8. Find the ratio of the numbers of cards in Box V to the number of cards in Box U at first.