Bryan and Adam have a total of $80.
Bryan spends
12 of his money and
Adam spends
14 of his money.
They spend $26 altogether.
- How much does Bryan have at first?
- How much does Adam have in the end?
|
Bryan |
Adam |
Before |
2 u |
4 p |
Change |
- 1 u |
- 1 p |
After |
1 u |
3 p |
(a)
Amount that Bryan has at first = 2 u
Amount that Adam has at first = 4 p
Total amount that they have = 2 u + 4 p = 80 --- (1)
Total amount that they spend = 1 u + 1 p = 26 --- (2)
(2)
x 4 4 u + 4 p = 104 --- (3)
(3) - (1)
(4 u + 4 p) - (2 u + 4 p) = 104 - 80
4 u + 4 p - 2 u - 4 p = 104 - 80
4 u - 2 u + 4 p - 4 p = 24
4 u - 2 u = 24
2 u = 24
1 u = 24 ÷ 2 = 12
Substitute 1 u = 12 into (1).
2 u + 4 p = 80
2 x 12 + 4 p = 80
24 + 4 p = 80
4 p = 80 - 24 = 56
1 p = 56 ÷ 4 = 14
Amount that Bryan has at first
= 2 u
= 2 x 12
= $24
(b)
Amount that Adam has in the end
= 4 p - 1 p
= 3 p
= 3 x 14
= $42
Answer(s): (a) $24; (b) $42