PSLEOlivia and Xuan went shopping together with a total amount of $117.60. Olivia spent 2 times as much as Xuan. The amount Xuan had left was $37 more than what she had spent. She had 2 times as much money left as Olivia.
(a) How much money did Xuan spend?
(b) How much money did Olivia have at first?
|
Olivia |
Xuan |
Total |
Before |
2.5 u + 18.5 |
2 u + 37 |
117.60 |
Change |
- 2 u |
- 1 u |
|
After |
0.5 u + 18.5 |
1 u + 37 |
|
(a)
Total amount that Olivia and Xuan had at first
= (2.5 u + 18.5) + (2 u + 37)
= 2.5 u + 2 u + 18.5 + 37
= 4.5 u + 55.5
4.5 u + 55.5 = 117.6
4.5 u = 117.6 - 55.5
4.5 u = 62.1
1 u = 62.1 ÷ 4.5 = 13.8
Amount that Xuan had at first
= 1 u
= $13.80
(b)
Amount that Olivia had at first
= 2.5 u + 18.5
= (2.5 x 13.8) + 18.5
= 34.5 + 18.5
= $53
Answer(s): (a) $13.80; (b) $53