Yoko had
37 as much money as Yen. Yoko had $36 less than Yen. Yoko spent some money to buy a birthday present for her buddy. In the end, she had
19 as much money as Yen. How much did Yoko spend on the birthday present?
| |
Yoko |
Yen |
| Before |
3 u |
7 u |
| Change |
- ? |
|
| After |
1 p |
9 p |
Amount that Yoko had less than Yen
= 7 u - 3 u
= 4 u
4 u = 36
1 u = 36 ÷ 4 = 9
Amount that Yoko had at first
= 3 u
= 3 x 9
= $27
Amount that Yen had
= 7 u
= 7 x 9
= $63
The amount that Yen had at first and in the end remains the same.
7 u = 9 p
9 p = 63
1 p = 63 ÷ 9 = 7
Amount that Yoko had in the end
= 1 p
= $7
Amount that Yoko spent on the birthday present
= 27 - 7
= $20
Answer(s): $20
