SOLUTION: Hello please please help me.....I am doing a test and I made it to the last two questions I need help with this one asap. I would appreciate your help. Robin A chem

Question 798221: Hello please please help me.....I am doing a test and I made it to the last two questions I need help with this one asap. I would appreciate your help.
Robin

A chemical company needs to paint forty-five chemical tanks including the top and the bottom of the tanks. Each tank has a height of 6 ft and a diameter of 4 ft. Paint can be purchased in 1-gallon cans or in 5-gallon cans that cost the same as 4 1-gallon cans. Each gallon of paint will cover 350 square feet. How many of each should be purchased to keep the cost of painting the tanks as low as possible?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Total surface area of 1 tank
2pir^2+pir^2h
2*22/7 *2^2+22/7*2^2*6
176/7 + 528/7
100.57 sq.ft
100.57*45 = 4526 sq.ft

350 sq.ft ------------1 gal
4526 sq.ft ----------12.93 gallons
13 gallons required
two cans of 5 gallons and 3 cans of 1 gallon

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