Last week, Jeremy had a total of 228 brown and grey files. Two weeks later, he sold
45 of all the brown files and 12 grey files. Now he has the same number of brown and grey files. How many files does he have in the end?
| |
Brown |
Grey |
Total |
| Before |
5 u |
1 u + 12 |
6 u + 12 |
| Change |
- 4 u |
- 12 |
|
| After |
1 u |
1 u |
|
Comparing the brown
and grey files in the end |
1 |
1 |
|
Total number of files at first
= 5 u + 1 u + 12
= 6 u + 12
6 u + 12 = 228
6 u = 228 - 12
6 u = 216
1 u = 216 ÷ 6 = 36
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 36
= 72
Answer(s): 72
