Gabby had
49 as much money as Barbara. Gabby had $40 less than Barbara. Gabby spent some money to buy a birthday present for her niece. In the end, she had
13 as much money as Barbara. How much did Gabby spend on the birthday present?
| |
Gabby |
Barbara |
| Before |
4 u |
9 u |
| Change |
- ? |
|
| After |
1 p |
3 p |
Amount that Gabby had less than Barbara
= 9 u - 4 u
= 5 u
5 u = 40
1 u = 40 ÷ 5 = 8
Amount that Gabby had at first
= 4 u
= 4 x 8
= $32
Amount that Barbara had
= 9 u
= 9 x 8
= $72
The amount that Barbara had at first and in the end remains the same.
9 u = 3 p
3 p = 72
1 p = 72 ÷ 3 = 24
Amount that Gabby had in the end
= 1 p
= $24
Amount that Gabby spent on the birthday present
= 32 - 24
= $8
Answer(s): $8
