Gwen had
49 as much money as Tiffany. Gwen had $45 less than Tiffany. Gwen spent some money to buy a birthday present for her uncle. In the end, she had
13 as much money as Tiffany. How much did Gwen spend on the birthday present?
| |
Gwen |
Tiffany |
| Before |
4 u |
9 u |
| Change |
- ? |
|
| After |
1 p |
3 p |
Amount that Gwen had less than Tiffany
= 9 u - 4 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Amount that Gwen had at first
= 4 u
= 4 x 9
= $36
Amount that Tiffany had
= 9 u
= 9 x 9
= $81
The amount that Tiffany had at first and in the end remains the same.
9 u = 3 p
3 p = 81
1 p = 81 ÷ 3 = 27
Amount that Gwen had in the end
= 1 p
= $27
Amount that Gwen spent on the birthday present
= 36 - 27
= $9
Answer(s): $9
