Dylan and Mark had 75 files. After Dylan gave 22 files to Mark. Mark, in return, gave half of his files to Dylan. In the end, Dylan had twice as many files as Mark. How many files did Dylan have at first?
| |
Dylan |
Mark |
Total |
| Before |
1 u + 22 |
2 u - 22 |
75 |
| Change 1 |
- 22 |
+ 22 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
75 |
Total number of files that Dylan and Mark had at first and in the end remains unchanged.
Total number of files
= 2 u + 1 u
= 3 u
1 u = 75 ÷ 3 = 25
Number of files that Dylan had at first
= 1 u + 22
= 25 + 22
= 47
Answer(s): 47
