Adam and Charlie have the same amount of money.
Adam spends $10 and Charlie spends $40.
In the end, Adam has 3 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 |
3 u + 10 |
1 u + 40 |
Change |
- 10 |
- 40 |
After |
3 u |
1 u |
(a)
At first
Amount that Adam has = Amount that Charlie has
3 u + 10 = 1 u + 40
3 u - 1 u = 40 - 10
2 u = 30
1 u = 30 ÷ 2 = 15
Amount that each of them has at first
= 1 u + 40
= 15 + 40
= $55
(b)
Amount that Charlie has less than Adam in the end
= 3 u - 1 u
= 2 u
= 2 x 15
= $30
Answer(s): (a) $55; (b) $30