Glen had
25 as many stamps as Cathy. After Glen gave away 65 stamps, he had 71 less stamps than Cathy. How many stamps did Cathy have?
| |
Glen |
Cathy |
| Before |
2 u |
5 u |
| Change |
- 65 |
|
| After |
2 u - 65 |
5 u |
Cathy had 71 more stamps than Glen in the end. So, if Glen had another 71 stamps, he would have the same number of stamps as Cathy.
5 u = 2 u - 65 + 71
5 u - 2 u = 71 - 65
3 u = 6
1 u = 6 ÷ 3 = 2
Number of stamps that Cathy had at first
= 5 u
= 5 x 2
= 10
Answer: 10
