Ian and Dana shared some erasers equally. After Dana bought 69 erasers and Ian gave 88 erasers away, they had 571 erasers left. How many erasers did each of them have at first?
| |
Ian |
Dana |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 69 |
- 88 |
|
| After |
1 u + 69 |
1 u - 88 |
571 |
Ian and Dana had the same number of erasers at first.
Total number of erasers in the end
= 1 u + 69 + 1 u - 88
= 1 u + 1 u + 69 - 88
= 2 u - 19
2 u - 19 = 571
2 u = 571 + 19
2 u = 590
1 u = 590 ÷ 2 = 295
Number of erasers that each of them had at first
= 1 u
= 295
Answer(s): 295
