Charlie and Adam have the same amount of money.
Charlie spends $10 and Adam spends $70.
In the end, Charlie has 7 times as much money as Adam.
- How much does each of them have at first?
- How much does Adam have less than Charlie in the end?
|
Charlie |
Adam |
Before |
7 u + 10 |
1 u + 70 |
Change |
- 10 |
- 70 |
After |
7 u |
1 u |
(a)
At first
Amount that Charlie has = Amount that Adam has
7 u + 10 = 1 u + 70
7 u - 1 u = 70 - 10
6 u = 60
1 u = 60 ÷ 6 = 10
Amount that each of them has at first
= 1 u + 70
= 10 + 70
= $80
(b)
Amount that Adam has less than Charlie in the end
= 7 u - 1 u
= 6 u
= 6 x 10
= $60
Answer(s): (a) $80; (b) $60