Question

A room is 5.5 m long, 4 m wide and 3.5 m high. Find the cost of papering its walls with paper 90 cm wide at Rs 1.20 per mere.

Answer 1

Lateral surface area or area of walls=[2(l+b)×h].                                                      =[2(5.5+4)×3.5]sq units.                           =2×9.5×3.5 sq units.                                     =2×33.25 sq units.                                         =66.50sq units                                              length of paper required for papering the wall=0.9×66.50=59.85m.                         Cost of papering the wall=₹(1.20×59.85)=₹119.7

Answer 2

∴Cost of papering the Wall $119.7$ rupees

Step-by-step explanation:

Given;

$5.5m$ long , $4m$ wide and $3.5m$ high of a Room.

Total area of the room is given$=2(L+W)\times H$      Where  $L=$length,$W=$wide and $H=height$

∴Area of Room$=2(5.5+4)\times 3.5=66.50$ $m^{2}$

Length of paper required for papering the wall$=0.9\times 66.50=59.85$ $m^{3}$

So, Cost of papering the Wall$=1.20\times 59.85=119.7$ rupees