45 Sarah's money was equal to
25 of Xandra's money at first. After Sarah spent $2.20 and Xandra spent $1.10, Sarah had
25 as much money as Xandra.
- How much did Xandra have at first? Express your answer in 2 decimal places.
- How much did Sarah have in the end? Express your answer in 2 decimal places.
| |
Make p the same
(3)x5 |
Sarah
(1) |
Xandra
(2) |
Make p the same
(4)x2 |
| Before |
25 u |
5 u |
10 u |
20 u |
| Change |
- 11 |
- 2.2 |
- 1.1 |
- 2.2 |
| After |
10 p |
2 p |
5p |
10 p |
45 Sarah's money =
25 Xandra's money
45 Sarah's money =
410 Xandra's money
Sarah's money : Xandra's money = 5 : 10
(3) = (4)
25 u - 11 = 20 u - 2.2
25 u - 20 u = 11 - 2.2
5 u = 8.8
1 u = 1.76
Amount Xandra has at first
= 10 u
= 10 x 1.76
= 17.6 (a)
Amount Sarah has in the end
= 5 u - 2.2
= (5 x 1.76) - 2.2
= 6.6 (b)
Answers: (a) $17.60; (b) $6.60
