Final answer:
To find the initial amount of money Marty had, we can use the formula Amount left = Total amount - (Rate × Number of days). By plugging in the given values, we find that Marty initially had $110.
Step-by-step explanation:
The subject of this question is mathematics. The question involves calculating the amount of money left after a certain number of days based on a given rate of spending. To solve this problem, we can use the formula:
Amount left = Total amount - (Rate × Number of days)
In this case, Marty spent money at an average rate of $3 per day and after 14 days he had $68 left. So, we can plug in the given values into the formula:
68 = Total amount - (3 × 14)
Simplifying the equation, we find:
Total amount = 68 + (3 × 14)
Total amount = 68 + 42
Total amount = $110
Therefore, Marty initially had $110.