Question
There were some marbles in Packet S and Packet T. After Will transferred 15 of the marbles from Packet S to Packet T, the ratio of the number of marbles in Packet S to that in Packet T changed to 3 : 5. Find the ratio of the numbers of marbles in Packet T to the number of marbles in Packet S at first.
3 m

Click button first when a symbol is required. X

There were some marbles in Packet S and Packet T. After Will transferred 15 of the marbles from Packet S to Packet T, the ratio of the number of marbles in Packet S to that in Packet T changed to 3 : 5. Find the ratio of the numbers of marbles in Packet T to the number of marbles in Packet S at first.