Last week, Bryan had a total of 230 blue and black files. Two weeks later, he sold
23 of all the blue files and 26 black files. Now he has the same number of blue and black files. How many files does he have in the end?
| |
Blue |
Black |
Total |
| Before |
3 u |
1 u + 26 |
4 u + 26 |
| Change |
- 2 u |
- 26 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and black files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u + 26
= 4 u + 26
4 u + 26 = 230
4 u = 230 - 26
4 u = 204
1 u = 204 ÷ 4 = 51
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 51
= 102
Answer(s): 102
