Last week, Cody had a total of 246 grey and brown files. Two weeks later, he sold
23 of all the grey files and 30 brown files. Now he has the same number of grey and brown files. How many files does he have in the end?
| |
Grey |
Brown |
Total |
| Before |
3 u |
1 u + 30 |
4 u + 30 |
| Change |
- 2 u |
- 30 |
|
| After |
1 u |
1 u |
|
Comparing the grey
and brown files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u + 30
= 4 u + 30
4 u + 30 = 246
4 u = 246 - 30
4 u = 216
1 u = 216 ÷ 4 = 54
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 54
= 108
Answer(s): 108
