Question
There were some cards in Packet Y and Packet Z. After Peter transferred 14 of the cards from Packet Y to Packet Z, the ratio of the number of cards in Packet Y to that in Packet Z changed to 2 : 5. Find the ratio of the numbers of cards in Packet Y to the number of cards in Packet Z at first.
3 m

Click button first when a symbol is required. X

There were some cards in Packet Y and Packet Z. After Peter transferred 14 of the cards from Packet Y to Packet Z, the ratio of the number of cards in Packet Y to that in Packet Z changed to 2 : 5. Find the ratio of the numbers of cards in Packet Y to the number of cards in Packet Z at first.