Roshel had
37 as much money as Diana. Roshel had $40 less than Diana. Roshel spent some money to buy a birthday present for her mother. In the end, she had
15 as much money as Diana. How much did Roshel spend on the birthday present?
| |
Roshel |
Diana |
| Before |
3 u |
7 u |
| Change |
- ? |
|
| After |
1 p |
5 p |
Amount that Roshel had less than Diana
= 7 u - 3 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Amount that Roshel had at first
= 3 u
= 3 x 10
= $30
Amount that Diana had
= 7 u
= 7 x 10
= $70
The amount that Diana had at first and in the end remains the same.
7 u = 5 p
5 p = 70
1 p = 70 ÷ 5 = 14
Amount that Roshel had in the end
= 1 p
= $14
Amount that Roshel spent on the birthday present
= 30 - 14
= $16
Answer(s): $16
