Dana had twice as much money as Risa. After Dana spent $14 and Risa spent $6, Dana had $21 more than Risa. How much did Dana have in the end?
| |
Dana |
Risa |
| Before |
2 u |
1 u |
| Change |
- $14 |
- $6 |
| After |
2 u - $14 |
1 u - $6 |
Comparing Dana
and Risa
in the end |
$21 more |
|
If Risa was given another $21, the amounts that Dana and Risa each had in the end would be the same.
2 u - 14 = 1 u - 6 + 21
2 u - 1 u = 14 + 15
1 u = 29
1 u = 29 ÷ 1 = 29
Amount that Dana had in the end
= 2 u - 14
= 2 x 29 - 14
= 58 - 14
= $44
Answer(s): $44
