Question

A room is 5 m long , 4 .5 m broad and 3 .5m high .Find the area of the four walls , if the area of ।Windows and doors account for one - fifth of the area of the walls .If whitewashing costs |950 perm how much will it cost to whitewash the walls ?

Answer 1

area of 4 walls

$= peremeter \times height$

$= 19 \times 3.5 {m}^{2}$

$= 66.5 {m}^{2}$

area of windows and doors

$= 66.5 \div 5$

$= 13.3 {m}^{2}$

remaining area =66.5 - 13.3 = 53.2

then cost = 53.2× 950 =₹ 50540