Oliver and Raeann shared some pens equally. After Raeann bought 90 pens and Oliver gave 167 pens away, they had 209 pens left. How many pens did each of them have at first?
| |
Oliver |
Raeann |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 90 |
- 167 |
|
| After |
1 u + 90 |
1 u - 167 |
209 |
Oliver and Raeann had the same number of pens at first.
Total number of pens in the end
= 1 u + 90 + 1 u - 167
= 1 u + 1 u + 90 - 167
= 2 u - 77
2 u - 77 = 209
2 u = 209 + 77
2 u = 286
1 u = 286 ÷ 2 = 143
Number of pens that each of them had at first
= 1 u
= 143
Answer(s): 143
