Natalie had
38 as much money as Barbara. Natalie had $45 less than Barbara. Natalie spent some money to buy a birthday present for her friend. In the end, she had
13 as much money as Barbara. How much did Natalie spend on the birthday present?
| |
Natalie |
Barbara |
| Before |
3 u |
8 u |
| Change |
- ? |
|
| After |
1 p |
3 p |
Amount that Natalie had less than Barbara
= 8 u - 3 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Amount that Natalie had at first
= 3 u
= 3 x 9
= $27
Amount that Barbara had
= 8 u
= 8 x 9
= $72
The amount that Barbara had at first and in the end remains the same.
8 u = 3 p
3 p = 72
1 p = 72 ÷ 3 = 24
Amount that Natalie had in the end
= 1 p
= $24
Amount that Natalie spent on the birthday present
= 27 - 24
= $3
Answer(s): $3
