Dylan and Kathy shared some buttons equally. After Kathy bought 86 buttons and Dylan gave 90 buttons away, they had 304 buttons left. How many buttons did each of them have at first?
| |
Dylan |
Kathy |
Total |
| Before |
1 u |
1 u |
|
| Change |
+ 86 |
- 90 |
|
| After |
1 u + 86 |
1 u - 90 |
304 |
Dylan and Kathy had the same number of buttons at first.
Total number of buttons in the end
= 1 u + 86 + 1 u - 90
= 1 u + 1 u + 86 - 90
= 2 u - 4
2 u - 4 = 304
2 u = 304 + 4
2 u = 308
1 u = 308 ÷ 2 = 154
Number of buttons that each of them had at first
= 1 u
= 154
Answer(s): 154
