35 Wendy's money was equal to
25 of Cathy's money at first. After Wendy spent $1.80 and Cathy spent $1.20, Wendy had
25 as much money as Cathy.
- How much did Cathy have at first? Express your answer in 2 decimal places.
- How much did Wendy have in the end? Express your answer in 2 decimal places.
| |
Make p the same
(3)x5 |
Wendy
(1) |
Cathy
(2) |
Make p the same
(4)x2 |
| Before |
50 u |
10 u |
15 u |
30 u |
| Change |
- 9 |
- 1.8 |
- 1.2 |
- 2.4 |
| After |
10 p |
2 p |
5p |
10 p |
35 Wendy's money =
25 Cathy's money
610 Wendy's money =
615 Cathy's money
Wendy's money : Cathy's money = 10 : 15
(3) = (4)
50 u - 9 = 30 u - 2.4
50 u - 30 u = 9 - 2.4
20 u = 6.6
1 u = 0.33
Amount Cathy has at first
= 15 u
= 15 x 0.33
= 4.95 (a)
Amount Wendy has in the end
= 10 u - 1.8
= (10 x 0.33) - 1.8
= 1.5 (b)
Answers: (a) $4.95; (b) $1.50
