Oscar and Xandra shared some pens equally. After Xandra bought 27 pens and Oscar gave 52 pens away, they had 519 pens left. How many pens did each of them have at first?
| |
Oscar |
Xandra |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 27 |
- 52 |
|
| After |
1 u + 27 |
1 u - 52 |
519 |
Oscar and Xandra had the same number of pens at first.
Total number of pens in the end
= 1 u + 27 + 1 u - 52
= 1 u + 1 u + 27 - 52
= 2 u - 25
2 u - 25 = 519
2 u = 519 + 25
2 u = 544
1 u = 544 ÷ 2 = 272
Number of pens that each of them had at first
= 1 u
= 272
Answer(s): 272
