High Museum math

Question

Find the surface area of the lobby and determine the amount of paint needed to cover the walls and ceiling.

(1 gallon covers 400 square feet for a cost of 27.85)

Answer 1

if the museum lobby were 20 by 20 by 20, with 4 walls and a ceiling to be painted, that's about 20x20 = 400 ft^2 for the ceiling, and another 4 times 20x20 for each wall, for a total 2,000 ft^2 which requires 2000/400 = 5 gallons of paint

$27.85 per gallon times 5 = $139.25 cost to paint the place