Question

A seminar hall has length 15m width 10 m and height 21 m if the door length is 3 m and width 2 m and window length is 3 m and width is 2m then find out require a paint if paint is require 1 litre 18meter square

Answer 1

$total \: area \: to \: be \: painted \: = area \: of \: 4walls - area \: of \: window \: and \: doors \\ = 2(lb + bh + lh) - ((l \times b)of \: door + (l \times b)of \: window )\\ = 2(15 \times 10 + 10 \times 21 + 15 \times 21) - ((3 \times 2) + (3 \times 2)) \\ = 2(150 + 210 + 315) - (6 + 6) \\ = 2(675) - 12 \\ = 1350 - 12 \\ = 1338 {m}^{2} \\ required \: paint \: = \frac{1338}{18} = 74.33ltrs$