Cindy had
310 as much money as Zara. Cindy had $49 less than Zara. Cindy spent some money to buy a birthday present for her nephew. In the end, she had
15 as much money as Zara. How much did Cindy spend on the birthday present?
| |
Cindy |
Zara |
| Before |
3 u |
10 u |
| Change |
- ? |
|
| After |
1 p |
5 p |
Amount that Cindy had less than Zara
= 10 u - 3 u
= 7 u
7 u = 49
1 u = 49 ÷ 7 = 7
Amount that Cindy had at first
= 3 u
= 3 x 7
= $21
Amount that Zara had
= 10 u
= 10 x 7
= $70
The amount that Zara had at first and in the end remains the same.
10 u = 5 p
5 p = 70
1 p = 70 ÷ 5 = 14
Amount that Cindy had in the end
= 1 p
= $14
Amount that Cindy spent on the birthday present
= 21 - 14
= $7
Answer(s): $7
