There were some erasers in Box A and Box B. After Dylan transferred
15 of the erasers from Box A to Box B, the ratio of the number of erasers in Box A to that in Box B changed to 3 : 8. Find the ratio of the numbers of erasers in Box B to the number of erasers in Box A at first.
| |
Box A |
Box B |
| Before |
5x3 =
15 u |
29 u |
| Change |
- 1x3 =
- 3 u |
+ 3 u |
| After |
4x3 =
12 u |
|
Comparing Box A and
Box B in the end |
3x4 =
12 u |
8x4 =
32 u |
The number of erasers in Box A in the end is repeated. Make the number of erasers in Box A in the end the same. LCM of 4 and 3 is 12.
At first
Box B : Box A
29: 15
Answer(s): 29: 15
