Perry and Peter had 90 files. After Perry gave 14 files to Peter. Peter, in return, gave half of his files to Perry. In the end, Perry had twice as many files as Peter. How many files did Perry have at first?
| |
Perry |
Peter |
Total |
| Before |
1 u + 14 |
2 u - 14 |
90 |
| Change 1 |
- 14 |
+ 14 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
90 |
Total number of files that Perry and Peter had at first and in the end remains unchanged.
Total number of files
= 2 u + 1 u
= 3 u
1 u = 90 ÷ 3 = 30
Number of files that Perry had at first
= 1 u + 14
= 30 + 14
= 44
Answer(s): 44
