Last week, Fabian had a total of 177 purple and blue files. Two weeks later, he sold
23 of all the purple files and 17 blue files. Now he has the same number of purple and blue files. How many files does he have in the end?
| |
Purple |
Blue |
Total |
| Before |
3 u |
1 u + 17 |
4 u + 17 |
| Change |
- 2 u |
- 17 |
|
| After |
1 u |
1 u |
|
Comparing the purple
and blue files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u + 17
= 4 u + 17
4 u + 17 = 177
4 u = 177 - 17
4 u = 160
1 u = 160 ÷ 4 = 40
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 40
= 80
Answer(s): 80
