Anna had
38 as much money as Penelope. Anna had $50 less than Penelope. Anna spent some money to buy a birthday present for her cousin. In the end, she had
110 as much money as Penelope. How much did Anna spend on the birthday present?
| |
Anna |
Penelope |
| Before |
3 u |
8 u |
| Change |
- ? |
|
| After |
1 p |
10 p |
Amount that Anna had less than Penelope
= 8 u - 3 u
= 5 u
5 u = 50
1 u = 50 ÷ 5 = 10
Amount that Anna had at first
= 3 u
= 3 x 10
= $30
Amount that Penelope had
= 8 u
= 8 x 10
= $80
The amount that Penelope had at first and in the end remains the same.
8 u = 10 p
10 p = 80
1 p = 80 ÷ 10 = 8
Amount that Anna had in the end
= 1 p
= $8
Amount that Anna spent on the birthday present
= 30 - 8
= $22
Answer(s): $22
