Zoe had
35 as much money as Fiona. Zoe had $36 less than Fiona. Zoe spent some money to buy a birthday present for her father. In the end, she had
110 as much money as Fiona. How much did Zoe spend on the birthday present?
| |
Zoe |
Fiona |
| Before |
3 u |
5 u |
| Change |
- ? |
|
| After |
1 p |
10 p |
Amount that Zoe had less than Fiona
= 5 u - 3 u
= 2 u
2 u = 36
1 u = 36 ÷ 2 = 18
Amount that Zoe had at first
= 3 u
= 3 x 18
= $54
Amount that Fiona had
= 5 u
= 5 x 18
= $90
The amount that Fiona had at first and in the end remains the same.
5 u = 10 p
10 p = 90
1 p = 90 ÷ 10 = 9
Amount that Zoe had in the end
= 1 p
= $9
Amount that Zoe spent on the birthday present
= 54 - 9
= $45
Answer(s): $45
