Question 640514
A grocery store bought ice cream for $2.60 a half gallon and stored it in two freezers. During the night, one freezer malfunctioned and ruined 15 half gallons. If the remaining ice cream is sold for $3.98 per half gallon, how many half gallons did the store buy if it made a profit of $64.20?
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let x=number of  half gallons of ice cream the store bought
x-15=number of unspoiled half gallons of ice cream
..
3.98(x-15)-2.60x=64.20
3.98x-59.70)-2.60x=64.20
1.38x=64.20+59.70=123.90
x=123.90/1.38≈89.78≈90 half gallons
number of  half gallons of ice cream the store bought=90 half gallons