Penelope had
25 as much money as Pamela. Penelope had $42 less than Pamela. Penelope spent some money to buy a birthday present for her neighbour. In the end, she had
110 as much money as Pamela. How much did Penelope spend on the birthday present?
|
Penelope |
Pamela |
Before |
2 u |
5 u |
Change |
- ? |
|
After |
1 p |
10 p |
Amount that Penelope had less than Pamela
= 5 u - 2 u
= 3 u
3 u = 42
1 u = 42 ÷ 3 = 14
Amount that Penelope had at first
= 2 u
= 2 x 14
= $28
Amount that Pamela had
= 5 u
= 5 x 14
= $70
The amount that Pamela had at first and in the end remains the same.
5 u = 10 p
10 p = 70
1 p = 70 ÷ 10 = 7
Amount that Penelope had in the end
= 1 p
= $7
Amount that Penelope spent on the birthday present
= 28 - 7
= $21
Answer(s): $21