Paul had
25 as many buttons as Linda. After Paul bought another 10 buttons, he had 20 less buttons than Linda. How many buttons did Paul have at first?
| |
Paul |
Linda |
| Before |
2 u |
5 u |
| Change |
+ 10 |
|
| After |
2 u + 10 |
5 u |
Linda had 20 more buttons than Paul in the end. So, if Paul had another 20 buttons, he would have the same number of buttons as Linda.
5 u = 2 u + 10 + 20
5 u - 2 u = 10 + 20
3 u = 30
1 u = 30 ÷ 3 = 10
Number of buttons that Paul had at first
= 2 u
= 2 x 10
= 20
Answer: 20
