B. b) A rectangular room is 6 m long, 5 m wide and 4 m high. Find the total surface area of the four walls
.
(ii) If the windows and door in the above room are made up of 20% of the wall area, how much paint will
be needed to give the four walls (excluding the windows and door) two coats of paint if a litre of paint
is used to cover 18 m2 in one coat.
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surface area of cuboid =2(lb+bh+hl)
=2(30+20+24)
=2×74
=148m square
1 litre paint =18m square
148-20°/•=118.4m square
paint=18÷118.4=6.57litre
including second coat=6.57×2
=13.14litre
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