Question
There were some buttons in Bag Q and Bag R. After Caden transferred 13 of the buttons from Bag Q to Bag R, the ratio of the number of buttons in Bag Q to that in Bag R changed to 3 : 7. Find the ratio of the numbers of buttons in Bag R to the number of buttons in Bag Q at first.
3 m

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There were some buttons in Bag Q and Bag R. After Caden transferred 13 of the buttons from Bag Q to Bag R, the ratio of the number of buttons in Bag Q to that in Bag R changed to 3 : 7. Find the ratio of the numbers of buttons in Bag R to the number of buttons in Bag Q at first.