Peter had $30 more than Sarah. After Sarah spent
19 of her money, Peter had thrice as much money as Sarah. How much money did Peter have at first?
| |
Peter |
Sarah |
| Before |
24 u |
9 u |
| Change |
|
- 1 u |
| After |
24 u |
8 u |
Amount that Peter had in the end
= 3 x 8 u
= 24 u
If Sarah had another $30 at first, the amounts that Peter and Sarah each had at first will be the same.
24 u = 9 u + 30
24 u - 9 u = 30
15 u = 30
1 u = 30 ÷ 15 = 2
Amount Peter had at first
= 24 u
= 24 x 2
= $48
Answer(s): $48
