I have to paint one side of a wall. The wall is $15$ meters tall and $60$ meters long. Each gallon of paint covers $400$ square feet. If a foot is approximately $0.3048$ meters, then what is the smallest whole number of gallons I can buy and have enough paint to cover the whole wall?
(15 m * 60 m * 1 ft /.3048 m * 1 ft / .3048 m ) / ( 400 ft^2 / gal ) = 24.22 gal ~~ 25 gallons required