Daniel and Sam had 72 staplers. After Daniel gave 15 staplers to Sam. Sam, in return, gave half of his staplers to Daniel. In the end, Daniel had twice as many staplers as Sam. How many staplers did Daniel have at first?
| |
Daniel |
Sam |
Total |
| Before |
1 u + 15 |
2 u - 15 |
72 |
| Change 1 |
- 15 |
+ 15 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
72 |
Total number of staplers that Daniel and Sam had at first and in the end remains unchanged.
Total number of staplers
= 2 u + 1 u
= 3 u
1 u = 72 ÷ 3 = 24
Number of staplers that Daniel had at first
= 1 u + 15
= 24 + 15
= 39
Answer(s): 39
