There were some stickers in Packet J and Packet K. After Fabian transferred
13 of the stickers from Packet J to Packet K, the ratio of the number of stickers in Packet J to that in Packet K changed to 1 : 7. Find the ratio of the numbers of stickers in Packet K to the number of stickers in Packet J at first.
|
Packet J |
Packet K |
Before |
3x1 = 3 u |
13 u |
Change |
- 1x1 = - 1 u |
+ 1 u |
After |
2x1 = 2 u |
|
Comparing Packet J and Packet K in the end |
1x2 = 2 u |
7x2 = 14 u |
The number of stickers in Packet J in the end is repeated. Make the number of stickers in Packet J in the end the same. LCM of 2 and 1 is 2.
At first
Packet K : Packet J
13: 3
Answer(s): 13: 3