Question

room 8 metre long and 5 metre broad and 4 metre has has two doors 1.5 by 1 and 3 windows each 1.2 by 80 cm find number 1 area of four walls in excluding doors and windows number to the cost of distempering from inside @ rupees 2 per metre square​

Answer 1

Area of 4 walls excluding the doors and windows = Total area of 4 walls - (Area of doors + Area of windows)

$2(5 \times 4 + 8 \times 4) - (1.5 \times 1 + 3 \times 1.2 \times 0.8) = 99.62$

99.62 * 2 =199.24