Mark and Oscar have the same amount of money. If Mark spends $43 a day and Oscar spends $14 a day, Oscar will have $319 when Mark uses up all his money. If Mark spends $14 a day and Oscar spends $43 a day, how much will Mark have left when Oscar uses up all his money?
| |
Case 1 |
Case 2 |
| |
Mark |
Oscar |
Mark |
Oscar |
| Before |
43 u |
14 u + $319 |
43 u |
43 u |
| Change |
- 43 u |
- 14 u |
- 14 u |
- 43 u |
| After |
0 |
$319 |
29 u |
0 |
The amounts that Mark and Oscar have at first are the same.
43 u = 14 u + 319
43 u - 14 u = 319
29 u = 319
1 u = 319 ÷ 29 = 11
Amount that Mark will have left when Oscar uses up all his money
= 43 u - 14 u
= 29 u
= 29 x 11
= $319
Answer(s): $319
