Sean and Erika shared some pens equally. After Erika bought 82 pens and Sean gave 189 pens away, they had 487 pens left. How many pens did each of them have at first?
| |
Sean |
Erika |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 82 |
- 189 |
|
| After |
1 u + 82 |
1 u - 189 |
487 |
Sean and Erika had the same number of pens at first.
Total number of pens in the end
= 1 u + 82 + 1 u - 189
= 1 u + 1 u + 82 - 189
= 2 u - 107
2 u - 107 = 487
2 u = 487 + 107
2 u = 594
1 u = 594 ÷ 2 = 297
Number of pens that each of them had at first
= 1 u
= 297
Answer(s): 297
