Agrocery store bought milk for $2.50 per half gallon and stored it in two refrigerators. during the night, one refrigerator malfunctioned and ruined 14 half gallons. if the remaining milk is sold for $3.98 per half gallon, how many half gallons did the store buy if they made a profit of $74.52?

In this problem, we let x be the number of half gallons of milk the store bought, and x-12 be the remaining half gallonsWe use the equation profit = revenue-cost
 88.08=4.02(x-12)-2.60x88.08=4.02x-48.24-2.6x1.42x=88.08+48.24=136.32x=136.32/1.42=96Hence, the number of half gallons of milk the store bought is 96

Subtracting is the opposite of adding