Calculate the number of gallons of paint needed to cover the walls of a room 11'X12'X8'. each gallon covers 300 square feet

No. of gallons required = csa of cuboid+area of rectangle/300

= 2 (l+b) h + l*b / 300

= 2 (11+12) 8 + 11 * 12 / 300

=368+132/300

= 500/300

=5/3 = 1.666 ... = 1.7

= 2 approx.

therefore 2 gallons should be used