Last week, Julian had a total of 179 silver and red files. Two weeks later, he sold
23 of all the silver files and bought another 9 red files. Now he has the same number of silver and red files. How many files does he have in the end?
| |
Silver |
Red |
Total |
| Before |
3 u |
1 u - 9 |
4 u - 9 |
| Change |
- 2 u |
+ 9 |
|
| After |
1 u |
1 u |
|
Comparing the silver
and red files in the end |
1 |
1 |
|
Total number of files at first
= 3 u + 1 u - 9
= 4 u - 9
4 u - 9 = 179
4 u = 179 + 9
4 u = 188
1 u = 188 ÷ 4 = 47
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 47
= 94
Answer(s): 94
