Andy had 5 times as many white files as brown files. After giving away 5 white files and buying another 23 brown files, he had an equal number of white and brown files. How many white files did Andy have at first?
| |
White files |
Brown files |
| Before |
5 u |
1 u |
| Change |
- 5 |
+ 23 |
| After |
5 u - 5 |
1 u + 23 |
The number of white and brown files is the same in the end.
5 u - 5 = 1 u + 23
5 u - 1 u = 23 + 5
4 u = 5 + 23
4 u = 28
1 u = 28 ÷ 4 = 7
Number of white files that Andy had at first
= 5 u
= 5 x 7
= 35
Answer(s): 35
