Last week, Daniel had a total of 183 yellow and red files. Two weeks later, he sold
23 of all the yellow files and 19 red files. Now he has the same number of yellow and red files. How many files does he have in the end?
| |
Yellow |
Red |
Total |
| Before |
3 u |
1 u + 19 |
4 u + 19 |
| Change |
- 2 u |
- 19 |
|
| After |
1 u |
1 u |
|
Comparing the yellow
and red files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u + 19
= 4 u + 19
4 u + 19 = 183
4 u = 183 - 19
4 u = 164
1 u = 164 ÷ 4 = 41
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 41
= 82
Answer(s): 82
