David had
58 as many stamps as Xandra. After David gave away 31 stamps, he had 61 less stamps than Xandra. How many stamps did Xandra have?
| |
David |
Xandra |
| Before |
5 u |
8 u |
| Change |
- 31 |
|
| After |
5 u - 31 |
8 u |
Xandra had 61 more stamps than David in the end. So, if David had another 61 stamps, he would have the same number of stamps as Xandra.
8 u = 5 u - 31 + 61
8 u - 5 u = 61 - 31
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stamps that Xandra had at first
= 8 u
= 8 x 10
= 80
Answer: 80
