Last week, Sean had a total of 66 yellow and blue files. Two weeks later, he sold
34 of all the yellow files and 6 blue files. Now he has the same number of yellow and blue files. How many files does he have in the end?
| |
Yellow |
Blue |
Total |
| Before |
4 u |
1 u + 6 |
5 u + 6 |
| Change |
- 3 u |
- 6 |
|
| After |
1 u |
1 u |
|
Comparing the yellow
and blue files in the end |
1 |
1 |
|
Total number of files at first
= 4 u + 1 u + 6
= 5 u + 6
5 u + 6 = 66
5 u = 66 - 6
5 u = 60
1 u = 60 ÷ 5 = 12
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 12
= 24
Answer(s): 24
