Last week, Brandon had a total of 112 blue and grey files. Two weeks later, he sold
45 of all the blue files and 22 grey files. Now he has the same number of blue and grey files. How many files does he have in the end?
| |
Blue |
Grey |
Total |
| Before |
5 u |
1 u + 22 |
6 u + 22 |
| Change |
- 4 u |
- 22 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and grey files in the end |
1 |
1 |
|
Total number of files at first
= 5 u + 1 u + 22
= 6 u + 22
6 u + 22 = 112
6 u = 112 - 22
6 u = 90
1 u = 90 ÷ 6 = 15
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 15
= 30
Answer(s): 30
