Bryan has 7 times as much money as Charlie.
After Bryan has spent $100,
he has 3 times as much money as Charlie.
- How much money does Charlie have?
- How much money does Bryan have in the end?
- How much money do they have at first?
- How much do they have in the end?
|
Bryan |
Charlie |
Before |
7 u |
1 u |
Change |
- $100 |
No change |
After |
3 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 Bryan has spent
= 7 u - 3 u
= 4 u
4 u = 100
1 u = 100 ÷ 4 = 25
Amount that Charlie has
= 1 u
= $25
(b)
Amount that Bryan has in the end
= 3 u
= 3 x 25
= $75
(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
= 3 u + 1 u
= 4 u
= 4 x 25
= $100
Answer(s): (a) $25; (b) $75; (c) $200; (d) $100