Question
There were some buttons in Bag W and Bag X. After David transferred 15 of the buttons from Bag W to Bag X, the ratio of the number of buttons in Bag W to that in Bag X changed to 3 : 5. Find the ratio of the numbers of buttons in Bag W to the number of buttons in Bag X at first.
3 m

Click button first when a symbol is required. X

There were some buttons in Bag W and Bag X. After David transferred 15 of the buttons from Bag W to Bag X, the ratio of the number of buttons in Bag W to that in Bag X changed to 3 : 5. Find the ratio of the numbers of buttons in Bag W to the number of buttons in Bag X at first.