David had 4 times as much money as Zane. After David had spent half of his money, he had $31 more than Zane. How much money did David have at first?
| |
David |
Zane |
| Before |
4 u |
1 u |
| Change |
- 2 u |
|
| After |
2 u |
1 u |
Amount that David had after he spent half of his money
= 4 u ÷ 2
= 2 u
Amount that David had more than Zane in the end
= 2 u - 1 u
= 1 u
1 u = 31
Amount that David had at first
= 4 u
= 4 x 31
= $124
Answer(s): $124
