Xuan had
49 as much money as Tiffany. Xuan had $40 less than Tiffany. Xuan spent some money to buy a birthday present for her friend. In the end, she had
18 as much money as Tiffany. How much did Xuan spend on the birthday present?
| |
Xuan |
Tiffany |
| Before |
4 u |
9 u |
| Change |
- ? |
|
| After |
1 p |
8 p |
Amount that Xuan had less than Tiffany
= 9 u - 4 u
= 5 u
5 u = 40
1 u = 40 ÷ 5 = 8
Amount that Xuan had at first
= 4 u
= 4 x 8
= $32
Amount that Tiffany had
= 9 u
= 9 x 8
= $72
The amount that Tiffany had at first and in the end remains the same.
9 u = 8 p
8 p = 72
1 p = 72 ÷ 8 = 9
Amount that Xuan had in the end
= 1 p
= $9
Amount that Xuan spent on the birthday present
= 32 - 9
= $23
Answer(s): $23
