Lucy had
38 as much money as Barbara. Lucy had $35 less than Barbara. Lucy spent some money to buy a birthday present for her buddy. In the end, she had
17 as much money as Barbara. How much did Lucy spend on the birthday present?
| |
Lucy |
Barbara |
| Before |
3 u |
8 u |
| Change |
- ? |
|
| After |
1 p |
7 p |
Amount that Lucy had less than Barbara
= 8 u - 3 u
= 5 u
5 u = 35
1 u = 35 ÷ 5 = 7
Amount that Lucy had at first
= 3 u
= 3 x 7
= $21
Amount that Barbara had
= 8 u
= 8 x 7
= $56
The amount that Barbara had at first and in the end remains the same.
8 u = 7 p
7 p = 56
1 p = 56 ÷ 7 = 8
Amount that Lucy had in the end
= 1 p
= $8
Amount that Lucy spent on the birthday present
= 21 - 8
= $13
Answer(s): $13
