Last week, Howard had a total of 235 pink and grey files. Two weeks later, he sold
34 of all the pink files and 30 grey files. Now he has the same number of pink and grey files. How many files does he have in the end?
| |
Pink |
Grey |
Total |
| Before |
4 u |
1 u + 30 |
5 u + 30 |
| Change |
- 3 u |
- 30 |
|
| After |
1 u |
1 u |
|
Comparing the pink
and grey files in the end |
1 |
1 |
|
Total number of files at first
= 4 u + 1 u + 30
= 5 u + 30
5 u + 30 = 235
5 u = 235 - 30
5 u = 205
1 u = 205 ÷ 5 = 41
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 41
= 82
Answer(s): 82
