Adam has 7 times as much money as Charlie.
After Adam has spent $75,
he has 4 times as much money as Charlie.
- How much money does Charlie have?
- How much money does Adam have in the end?
- How much money do they have at first?
- How much do they have in the end?
|
Adam |
Charlie |
Before |
7 u |
1 u |
Change |
- $75 |
No change |
After |
4 u |
1 u |
(a)
The amount that Charlie has at first and in the end remains unchanged.
Make the amount that Charlie has the same using LCM of 1 and 1.
LCM of 1 and 1 = 1
Amount that Adam has spent
= 7 u - 4 u
= 3 u
3 u = 75
1 u = 75 ÷ 3 = 25
Amount that Charlie has
= 1 u
= $25
(b)
Amount that Adam has in the end
= 4 u
= 4 x 25
= $100
(c)
Amount that they have at first
= 7 u + 1 u
= 8 u
= 8 x 25
= $200
(d)
Amount that they have in the end
= 4 u + 1 u
= 5 u
= 5 x 25
= $125
Answer(s): (a) $25; (b) $100; (c) $200; (d) $125