Glen had 3 times as many green files as yellow files. After giving away 2 green files and buying another 2 yellow files, he had an equal number of green and yellow files. How many green files did Glen have at first?
| |
Green files |
Yellow files |
| Before |
3 u |
1 u |
| Change |
- 2 |
+ 2 |
| After |
3 u - 2 |
1 u + 2 |
The number of green and yellow files is the same in the end.
3 u - 2 = 1 u + 2
3 u - 1 u = 2 + 2
2 u = 2 + 2
2 u = 4
1 u = 4 ÷ 2 = 2
Number of green files that Glen had at first
= 3 u
= 3 x 2
= 6
Answer(s): 6
