Question
There were some pencils in Packet R and Packet S. After Sean transferred 13 of the pencils from Packet R to Packet S, the ratio of the number of pencils in Packet R to that in Packet S changed to 3 : 4. Find the ratio of the numbers of pencils in Packet R to the number of pencils in Packet S at first.
3 m

Click button first when a symbol is required. X

There were some pencils in Packet R and Packet S. After Sean transferred 13 of the pencils from Packet R to Packet S, the ratio of the number of pencils in Packet R to that in Packet S changed to 3 : 4. Find the ratio of the numbers of pencils in Packet R to the number of pencils in Packet S at first.