45 Barbara's money was equal to
25 of Winnie's money at first. After Barbara spent $2.40 and Winnie spent $0.90, Barbara had
25 as much money as Winnie.
- How much did Winnie have at first? Express your answer in 2 decimal places.
- How much did Barbara have in the end? Express your answer in 2 decimal places.
|
Make p the same (3)x5 |
Barbara (1) |
Winnie (2) |
Make p the same (4)x2 |
Before |
25 u |
5 u |
10 u |
20 u |
Change |
- 12 |
- 2.4 |
- 0.9 |
- 1.8 |
After |
10 p |
2 p |
5p |
10 p |
45 Barbara's money =
25 Winnie's money
45 Barbara's money =
410 Winnie's money
Barbara's money : Winnie's money = 5 : 10
(3) = (4)
25 u - 12 = 20 u - 1.8
25 u - 20 u = 12 - 1.8
5 u = 10.2
1 u = 2.04
Amount Winnie has at first
= 10 u
= 10 x 2.04
= 20.4 (a)
Amount Barbara has in the end
= 5 u - 2.4
= (5 x 2.04) - 2.4
= 7.8 (b)
Answers: (a) $20.40; (b) $7.80