David and Riordan had a total of 191 buttons at first. After David bought 22 more buttons and Riordan gave away 17 buttons, David now has the same number of buttons as Riordan. How many buttons did David have at first?
| |
David |
Riordan |
Total |
| Before |
1 u - 22 |
1 u + 17 |
191 |
| Change |
+ 22 |
- 17 |
|
| After |
1 u |
1 u |
196 |
Total number of buttons in the end
= 191 + 22 - 17
= 196
2 u = 196
1 u = 196 ÷ 2 = 98
Number of buttons that David had in the end
= 1 u
= 98
Number of buttons that David had at first
= 98 - 22
= 76
Answer(s): 76
