Warren had 4 times as many green pens as brown pens. After giving away 5 green pens and buying another 13 brown pens, he had an equal number of green and brown pens. How many green pens did Warren have at first?
| |
Green pens |
Brown pens |
| Before |
4 u |
1 u |
| Change |
- 5 |
+ 13 |
| After |
4 u - 5 |
1 u + 13 |
The number of green and brown pens is the same in the end.
4 u - 5 = 1 u + 13
4 u - 1 u = 13 + 5
3 u = 5 + 13
3 u = 18
1 u = 18 ÷ 3 = 6
Number of green pens that Warren had at first
= 4 u
= 4 x 6
= 24
Answer(s): 24
