Tom had $42 more than Barbara. After Barbara spent
25 of her money, Tom had four times as much money as Barbara. How much money did Tom have at first?
| |
Tom |
Barbara |
| Before |
12 u |
5 u |
| Change |
|
- 2 u |
| After |
12 u |
3 u |
Amount that Tom had in the end
= 4 x 3 u
= 12 u
If Barbara had another $42 at first, the amounts that Tom and Barbara each had at first will be the same.
12 u = 5 u + 42
12 u - 5 u = 42
7 u = 42
1 u = 42 ÷ 7 = 6
Amount Tom had at first
= 12 u
= 12 x 6
= $72
Answer(s): $72
