Nala can spend no more than $150 per month on gasoline. she has already purchased $60 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? 30n + 60 > 150 30n + 60 < 150 60n + 30 < 150 60n + 30 > 150