Solve this problem. find the number of gallons of paint needed to cover all four sides four sides) of the building shown with two coats of paint if one gallon covers 350 square feet. disregard windows and doors. round to the nearest gallon.

The complete question in the figure attached

1) calculate the area all four sides
A=[12+9+12+9]*8=336 ft²

if 1 gallons---------------------------- > covers 350 ft²
X------------------------------------ > 336 ft²
X=336/350=0.96 gallons
but remember 
that there are two coats of paint
therefore
0.96*2----------- > 1.92------- > 2 gallons

the answer is 2 gallons