Vaidev had $45 more than Risa. After Risa spent
13 of her money, Vaidev had four times as much money as Risa. How much money did Vaidev have at first?
| |
Vaidev |
Risa |
| Before |
8 u |
3 u |
| Change |
|
- 1 u |
| After |
8 u |
2 u |
Amount that Vaidev had in the end
= 4 x 2 u
= 8 u
If Risa had another $45 at first, the amounts that Vaidev and Risa each had at first will be the same.
8 u = 3 u + 45
8 u - 3 u = 45
5 u = 45
1 u = 45 ÷ 5 = 9
Amount Vaidev had at first
= 8 u
= 8 x 9
= $72
Answer(s): $72
