Ivan had $20 more than Justin. Every day, Ivan and Justin would spend an equal amount of money. After 10 days, Ivan was left with 2 times as much money as Justin. Given that Ivan had $140 at first, how much did each of them spend every day?
| |
Justin |
Ivan |
Difference |
| Before |
|
$140 |
$20 |
| Change |
- ? |
- ? |
|
| After |
1 u |
2 u |
1 u |
Since both Ivan and Justin 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 = 20
1 u = 20 ÷ 1 = 20
Amount that Ivan had in the end
= 2 u
= 2 x 20
= $40
Amount that Ivan had spent
= 140 - 40
= $100
Amount that each of them spent every day
= 100 ÷ 10
= $10
Answer(s): $10
