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.
|
Packet S |
Packet T |
Before |
5x3 = 15 u |
17 u |
Change |
- 1x3 = - 3 u |
+ 3 u |
After |
4x3 = 12 u |
|
Comparing Packet S and Packet T in the end |
3x4 = 12 u |
5x4 = 20 u |
The number of marbles in Packet S in the end is repeated. Make the number of marbles in Packet S in the end the same. LCM of 4 and 3 is 12.
At first
Packet T : Packet S
17: 15
Answer(s): 17: 15