Usha had
49 as much money as Cathy. Usha had $50 less than Cathy. Usha spent some money to buy a birthday present for her best friend. In the end, she had
16 as much money as Cathy. How much did Usha spend on the birthday present?
| |
Usha |
Cathy |
| Before |
4 u |
9 u |
| Change |
- ? |
|
| After |
1 p |
6 p |
Amount that Usha had less than Cathy
= 9 u - 4 u
= 5 u
5 u = 50
1 u = 50 ÷ 5 = 10
Amount that Usha had at first
= 4 u
= 4 x 10
= $40
Amount that Cathy had
= 9 u
= 9 x 10
= $90
The amount that Cathy had at first and in the end remains the same.
9 u = 6 p
6 p = 90
1 p = 90 ÷ 6 = 15
Amount that Usha had in the end
= 1 p
= $15
Amount that Usha spent on the birthday present
= 40 - 15
= $25
Answer(s): $25
