Nala can spend no more than 150 dollars per month on gasoline. She has already purchased 60 dollars in gas this month. Which inequality can be used to find the maximum number of fill-ups she can purchase during the rest of the month, assuming each fill-up costs 30 dollars ?

Let n represent the number of additional fill-ups. They cost 30n dollars, and the 60 dollars already spent brings the total to 30n + 60. Since Nala can spend no more than 150 dollars, the total must be less than or equal to 150. So the correct choice is D, 30n + 60 ≤ 150.

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