Question
There were some buttons in Packet G and Packet H. After Xavier transferred 13 of the buttons from Packet G to Packet H, the ratio of the number of buttons in Packet G to that in Packet H changed to 3 : 7. Find the ratio of the numbers of buttons in Packet H to the number of buttons in Packet G at first.
3 m

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There were some buttons in Packet G and Packet H. After Xavier transferred 13 of the buttons from Packet G to Packet H, the ratio of the number of buttons in Packet G to that in Packet H changed to 3 : 7. Find the ratio of the numbers of buttons in Packet H to the number of buttons in Packet G at first.