Last week, Ethan had a total of 64 green and pink files. Two weeks later, he sold
34 of all the green files and 9 pink files. Now he has the same number of green and pink files. How many files does he have in the end?
| |
Green |
Pink |
Total |
| Before |
4 u |
1 u + 9 |
5 u + 9 |
| Change |
- 3 u |
- 9 |
|
| After |
1 u |
1 u |
|
Comparing the green
and pink files in the end |
1 |
1 |
|
Total number of files at first
= 4 u + 1 u + 9
= 5 u + 9
5 u + 9 = 64
5 u = 64 - 9
5 u = 55
1 u = 55 ÷ 5 = 11
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 11
= 22
Answer(s): 22
