Oscar had $93 more than Riordan. Every day, Oscar and Riordan would spend an equal amount of money. After 7 days, Oscar was left with 4 times as much money as Riordan. Given that Oscar had $145 at first, how much did each of them spend every day?
| |
Riordan |
Oscar |
Difference |
| Before |
|
$145 |
$93 |
| Change |
- ? |
- ? |
|
| After |
1 u |
4 u |
3 u |
Since both Oscar and Riordan spent an equal amount of money every day, the difference in their amounts remains the same.
Difference in their amounts
= 4 u - 1 u
= 3 u
3 u = 93
1 u = 93 ÷ 3 = 31
Amount that Oscar had in the end
= 4 u
= 4 x 31
= $124
Amount that Oscar had spent
= 145 - 124
= $21
Amount that each of them spent every day
= 21 ÷ 7
= $3
Answer(s): $3
