Vincent and Xavier had 60 files. After Vincent gave 15 files to Xavier. Xavier, in return, gave half of his files to Vincent. In the end, Vincent had twice as many files as Xavier. How many files did Vincent have at first?
| |
Vincent |
Xavier |
Total |
| Before |
1 u + 15 |
2 u - 15 |
60 |
| Change 1 |
- 15 |
+ 15 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
60 |
Total number of files that Vincent and Xavier had at first and in the end remains unchanged.
Total number of files
= 2 u + 1 u
= 3 u
1 u = 60 ÷ 3 = 20
Number of files that Vincent had at first
= 1 u + 15
= 20 + 15
= 35
Answer(s): 35
