Question 1046651
eight 5 gallon drums of oil are on hand.
40 gal on hand

 If 2 gallons are used each day and the owner wants a 30 day supply on hand 
needs 60 gal on hand

60gal-40gal = 20gal
Needs to order 20gal/5gal/drum  0r 4 Drums should be ordered to have 30 day supply