Charlie and Bryan have the same amount of money.
Charlie spends $30 and Bryan spends $70.
In the end, Charlie has 3 times as much money as Bryan.
- How much does each of them have at first?
- How much does Charlie have more than Bryan in the end?
|
Charlie |
Bryan |
Before |
3 u + 30 |
1 u + 70 |
Change |
- 30 |
- 70 |
After |
3 u |
1 u |
(a)
At first
Amount that Charlie has = Amount that Bryan has
3 u + 30 = 1 u + 70
3 u - 1 u = 70 - 30
2 u = 40
1 u = 40 ÷ 2 = 20
Amount that each of them has at first
= 1 u + 70
= 20 + 70
= $90
(b)
Amount that Charlie has more than Bryan in the end
= 3 u - 1 u
= 2 u
= 2 x 20
= $40
Answer(s): (a) $90; (b) $40