Marion had
311 as much money as Shiyun. Marion had $40 less than Shiyun. Marion spent some money to buy a birthday present for her neighbour. In the end, she had
15 as much money as Shiyun. How much did Marion spend on the birthday present?
| |
Marion |
Shiyun |
| Before |
3 u |
11 u |
| Change |
- ? |
|
| After |
1 p |
5 p |
Amount that Marion had less than Shiyun
= 11 u - 3 u
= 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Amount that Marion had at first
= 3 u
= 3 x 5
= $15
Amount that Shiyun had
= 11 u
= 11 x 5
= $55
The amount that Shiyun had at first and in the end remains the same.
11 u = 5 p
5 p = 55
1 p = 55 ÷ 5 = 11
Amount that Marion had in the end
= 1 p
= $11
Amount that Marion spent on the birthday present
= 15 - 11
= $4
Answer(s): $4
