Zara and Tammy have some staplers in the ratio 3 : 13. Zara has 60 less staplers than Tammy. How many staplers must Tammy give to Zara so that they will have the same number of staplers?
| |
Zara |
Tammy |
Total |
| Before |
3 u |
13 u |
16 u |
| Change |
+ 5 u |
- 5 u |
|
After |
1x8 =
8 u |
1x8 =
8 u |
2x8 =
16 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 16 is 16.
Difference in the number of staplers at first
= 13 u - 3 u
= 10 u
10 u = 60
1 u = 60 ÷ 10 = 6
Number of staplers that each of them had in the end
= 16 u ÷ 2
= 8 u
Number of staplers that Tammy must give to Zara
= 8 u - 3 u
= 5 u
= 5 x 6
= 30
Answer(s): 30
