Barbara had the same number of green, black and grey pens at first. After giving some green and black pens and 43 grey pens away, Barbara had 238 pens left. There were 2 times as many green pens as black pens left. The number of grey pens left was 17 fewer than the number of green pens left. How many grey pens did she have at first?
| |
Black |
Green |
Grey |
Total |
| Before |
2 u + 26 |
2 u + 26 |
2 u + 26 |
|
| Change |
- 1 u - 26 |
- 26 |
- 43 |
|
| After |
1 u |
2 u |
2 u - 17 |
238 |
Barbara had the same number of green, black and grey pens at first.
Total number of pens in the end
= 1 u + 2 u + 2 u - 17
= 5 u - 17
5 u - 17 = 238
5 u = 238 + 17
5 u = 255
1 u = 255 ÷ 5 = 51
Number of grey pens that Barbara had at first
= 2 u - 17 + 43
= 2 u + 26
= 2 x 51 + 26
= 128
Answer(s): 128
