Rael had $21 more than David. Every day, Rael and David would spend an equal amount of money. After 5 days, Rael was left with 2 times as much money as David. Given that Rael had $57 at first, how much did each of them spend every day?
| |
David |
Rael |
Difference |
| Before |
|
$57 |
$21 |
| Change |
- ? |
- ? |
|
| After |
1 u |
2 u |
1 u |
Since both Rael and David spent an equal amount of money every day, the difference in their amounts remains the same.
Difference in their amounts
= 2 u - 1 u
= 1 u
1 u = 21
1 u = 21 ÷ 1 = 21
Amount that Rael had in the end
= 2 u
= 2 x 21
= $42
Amount that Rael had spent
= 57 - 42
= $15
Amount that each of them spent every day
= 15 ÷ 5
= $3
Answer(s): $3
