Sabrina had
310 as much money as Gabby. Sabrina had $49 less than Gabby. Sabrina spent some money to buy a birthday present for her buddy. In the end, she had
15 as much money as Gabby. How much did Sabrina spend on the birthday present?
| |
Sabrina |
Gabby |
| Before |
3 u |
10 u |
| Change |
- ? |
|
| After |
1 p |
5 p |
Amount that Sabrina had less than Gabby
= 10 u - 3 u
= 7 u
7 u = 49
1 u = 49 ÷ 7 = 7
Amount that Sabrina had at first
= 3 u
= 3 x 7
= $21
Amount that Gabby had
= 10 u
= 10 x 7
= $70
The amount that Gabby had at first and in the end remains the same.
10 u = 5 p
5 p = 70
1 p = 70 ÷ 5 = 14
Amount that Sabrina had in the end
= 1 p
= $14
Amount that Sabrina spent on the birthday present
= 21 - 14
= $7
Answer(s): $7
