There were some pens in Box K and Box L. After Harry transferred
15 of the pens from Box K to Box L, the ratio of the number of pens in Box K to that in Box L changed to 1 : 8. Find the ratio of the numbers of pens in Box L to the number of pens in Box K at first.
| |
Box K |
Box L |
| Before |
5x1 =
5 u |
31 u |
| Change |
- 1x1 =
- 1 u |
+ 1 u |
| After |
4x1 =
4 u |
|
Comparing Box K and
Box L in the end |
1x4 =
4 u |
8x4 =
32 u |
The number of pens in Box K in the end is repeated. Make the number of pens in Box K in the end the same. LCM of 4 and 1 is 4.
At first
Box L : Box K
31: 5
Answer(s): 31: 5
