SOLUTION: If 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank of diameter 20 feet?

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 Click here to see ALL problems on Geometry Word Problems Question 206149: If 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank of diameter 20 feet? Answer by Targetweek(62)   (Show Source): You can put this solution on YOUR website!SA of a sphere is given by... - Since the radius is half of the diameter (20), r = 10 Next plug the value in - - - - = Then divide SA by 400 and you get 3.14 Assuming that you buy 1 gallon cans of paint it would take 4 cans but it you want the exact number then it would be 3.14 gallons