Ivan had
79 as many stamps as Dana. After Ivan gave away 65 stamps, he had 71 less stamps than Dana. How many stamps did Dana have?
| |
Ivan |
Dana |
| Before |
7 u |
9 u |
| Change |
- 65 |
|
| After |
7 u - 65 |
9 u |
Dana had 71 more stamps than Ivan in the end. So, if Ivan had another 71 stamps, he would have the same number of stamps as Dana.
9 u = 7 u - 65 + 71
9 u - 7 u = 71 - 65
2 u = 6
1 u = 6 ÷ 2 = 3
Number of stamps that Dana had at first
= 9 u
= 9 x 3
= 27
Answer: 27
