Ken and Jean shared some erasers equally. After Jean bought 51 erasers and Ken gave 200 erasers away, they had 151 erasers left. How many erasers did each of them have at first?
| |
Ken |
Jean |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 51 |
- 200 |
|
| After |
1 u + 51 |
1 u - 200 |
151 |
Ken and Jean had the same number of erasers at first.
Total number of erasers in the end
= 1 u + 51 + 1 u - 200
= 1 u + 1 u + 51 - 200
= 2 u - 149
2 u - 149 = 151
2 u = 151 + 149
2 u = 300
1 u = 300 ÷ 2 = 150
Number of erasers that each of them had at first
= 1 u
= 150
Answer(s): 150
