Last week, George had a total of 111 green and grey files. Two weeks later, he sold
23 of all the green files and bought another 5 grey files. Now he has the same number of green and grey files. How many files does he have in the end?
| |
Green |
Grey |
Total |
| Before |
3 u |
1 u - 5 |
4 u - 5 |
| Change |
- 2 u |
+ 5 |
|
| After |
1 u |
1 u |
|
Comparing the green
and grey files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u - 5
= 4 u - 5
4 u - 5 = 111
4 u = 111 + 5
4 u = 116
1 u = 116 ÷ 4 = 29
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 29
= 58
Answer(s): 58
