Last week, Charlie had a total of 229 blue and silver files. Two weeks later, he sold
34 of all the blue files and 19 silver files. Now he has the same number of blue and silver files. How many files does he have in the end?
| |
Blue |
Silver |
Total |
| Before |
4 u |
1 u + 19 |
5 u + 19 |
| Change |
- 3 u |
- 19 |
|
| After |
1 u |
1 u |
|
Comparing the blue
and silver files in the end |
1 |
1 |
|
Total number of files at first
= 4 u + 1 u + 19
= 5 u + 19
5 u + 19 = 229
5 u = 229 - 19
5 u = 210
1 u = 210 ÷ 5 = 42
Number of files that he has in the end
= 1 u + 1 u
= 2 u
= 2 x 42
= 84
Answer(s): 84
