Question 30128
ASSUMING IT REQUIRES ALL THE PAINT TO PAINT BOTH SIDES THEN ONE SIDE HAS 750 SQUARE FEET BECAUSE 150/25=6 GALLONS TIMES 250 SQUARE FEET = 1500 SQUARE FEET.

THE AREA OF ONE SIDE IS (35+40)/2 OR 37.5 FEET 37.5H=750 OR H=750/37.5 OR 

H-20.