35 Mary's money was equal to
25 of Erika's money at first. After Mary spent $2.20 and Erika spent $1.20, Mary had
25 as much money as Erika.
- How much did Erika have at first? Express your answer in 2 decimal places.
- How much did Mary have in the end? Express your answer in 2 decimal places.
| |
Make p the same
(3)x5 |
Mary
(1) |
Erika
(2) |
Make p the same
(4)x2 |
| Before |
50 u |
10 u |
15 u |
30 u |
| Change |
- 11 |
- 2.2 |
- 1.2 |
- 2.4 |
| After |
10 p |
2 p |
5p |
10 p |
35 Mary's money =
25 Erika's money
610 Mary's money =
615 Erika's money
Mary's money : Erika's money = 10 : 15
(3) = (4)
50 u - 11 = 30 u - 2.4
50 u - 30 u = 11 - 2.4
20 u = 8.6
1 u = 0.43
Amount Erika has at first
= 15 u
= 15 x 0.43
= 6.45 (a)
Amount Mary has in the end
= 10 u - 2.2
= (10 x 0.43) - 2.2
= 2.1 (b)
Answers: (a) $6.45; (b) $2.10
