Lucy and Kimberly have some staplers in the ratio 3 : 7. Lucy has 64 less staplers than Kimberly. How many staplers must Kimberly give to Lucy so that they will have the same number of staplers?
| |
Lucy |
Kimberly |
Total |
| Before |
3 u |
7 u |
10 u |
| Change |
+ 2 u |
- 2 u |
|
After |
1x5 =
5 u |
1x5 =
5 u |
2x5 =
10 u |
The total number of staplers remains unchanged. Make the total number of staplers at first and in the end the same. LCM of 2 and 10 is 10.
Difference in the number of staplers at first
= 7 u - 3 u
= 4 u
4 u = 64
1 u = 64 ÷ 4 = 16
Number of staplers that each of them had in the end
= 10 u ÷ 2
= 5 u
Number of staplers that Kimberly must give to Lucy
= 5 u - 3 u
= 2 u
= 2 x 16
= 32
Answer(s): 32
