Adam and Charlie have the same amount of money.
Adam spends $40 and Charlie spends $70.
In the end, Adam has 4 times as much money as Charlie.
- How much does each of them have at first?
- How much does Charlie have less than Adam in the end?
|
Adam |
Charlie |
Before |
4 u + 40 |
1 u + 70 |
Change |
- 40 |
- 70 |
After |
4 u |
1 u |
(a)
At first
Amount that Adam has = Amount that Charlie has
4 u + 40 = 1 u + 70
4 u - 1 u = 70 - 40
3 u = 30
1 u = 30 ÷ 3 = 10
Amount that each of them has at first
= 1 u + 70
= 10 + 70
= $80
(b)
Amount that Charlie has less than Adam in the end
= 4 u - 1 u
= 3 u
= 3 x 10
= $30
Answer(s): (a) $80; (b) $30