Given:
Room size = 14 feet x 10 feet
Height of room wall = 12 feet
Door size = 8.5 feet x 3.5 feet
Window size = 6 feet x 4 feet
Area of walls = Length of wall x Height of wall
= [(14 x 2) + (10 x 2)] x 12 ………..(where 2 is number of walls)
= 576 sq.ft.
Area of roof or celling = Length x Breadth
= 14 x 10
= 140 sq.ft.
Opening deductions = 1 Door + 1 Window
= (8.5 x 3.5) + (6 x 4)
= 53.75 sq.ft.
Total surface area = (Area of walls + Area of celling) – opening deduction
= (576 + 140) – 53.75
= 662.25 sq.ft.
Paint Required
For 1 sq.ft. = 0.0189 litters (new wall)
For 1 sq.ft. = 0.0108 litters (old wall)
Paint Required For New Wall
= 662.25 x 0.0189
= 12.5 litter
Paint Required For Old Wall
= 662.25 x 0.0108
= 7.15 litter
