Bryan and Ryan had 54 files. After Bryan gave 12 files to Ryan. Ryan, in return, gave half of his files to Bryan. In the end, Bryan had twice as many files as Ryan. How many files did Bryan have at first?
| |
Bryan |
Ryan |
Total |
| Before |
1 u + 12 |
2 u - 12 |
54 |
| Change 1 |
- 12 |
+ 12 |
|
| After 1 |
1 u |
2 u |
|
| Change 2 |
+ 1 u |
- 1 u |
|
| After 2 |
2 u |
1 u |
54 |
Total number of files that Bryan and Ryan had at first and in the end remains unchanged.
Total number of files
= 2 u + 1 u
= 3 u
1 u = 54 ÷ 3 = 18
Number of files that Bryan had at first
= 1 u + 12
= 18 + 12
= 30
Answer(s): 30
