Gwen had
29 as much money as Xuan. Gwen had $49 less than Xuan. Gwen spent some money to buy a birthday present for her niece. In the end, she had
17 as much money as Xuan. How much did Gwen spend on the birthday present?
| |
Gwen |
Xuan |
| Before |
2 u |
9 u |
| Change |
- ? |
|
| After |
1 p |
7 p |
Amount that Gwen had less than Xuan
= 9 u - 2 u
= 7 u
7 u = 49
1 u = 49 ÷ 7 = 7
Amount that Gwen had at first
= 2 u
= 2 x 7
= $14
Amount that Xuan had
= 9 u
= 9 x 7
= $63
The amount that Xuan had at first and in the end remains the same.
9 u = 7 p
7 p = 63
1 p = 63 ÷ 7 = 9
Amount that Gwen had in the end
= 1 p
= $9
Amount that Gwen spent on the birthday present
= 14 - 9
= $5
Answer(s): $5
