Starlin's goal is to spend less than $415 on a trip. So far, he has spent $25 on gas for his car. He will spend $100 each day on other expenses.

Let d represent the number of days for Starlin's trip.

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Starlin's trip must last fewer than Response area days.

Starlin's trip must last fewer than 4 days.

To determine the maximum number of days Starlin's trip can last, we need to find the number of days that would exceed his budget of $415.

So far, Starlin has spent $25 on gas. He plans to spend $100 each day on other expenses.

Let's set up an equation to represent the total amount Starlin will spend on his trip:

Total trip cost = Gas cost + (Other expenses per day * Number of days)

Since Starlin wants to spend less than $415, we can write the inequality:

Total trip cost < $415

Substituting the values we know:

25 + (100 * d) < 415

Simplifying the equation:

25 + 100d < 415

Now, to solve for the maximum number of days (d), we can isolate the variable:

100d < 415 - 25
100d < 390

Finally, dividing both sides of the inequality by 100:

d < 390/100
d < 3.9

We know that the number of days (d) must be a whole number, so the maximum number of days for Starlin's trip is 3 days.

Therefore, the answer is "3" for the number of days Starlin's trip must last.

Starlin's trip must last fewer than 3 days.