Question

the internal measures of a cuboidal room are 12 metre x 8 metre x 4 metre find the total cost of the whitewashing all four walls of the room if the cost of whitewashing is rupees 5 per metre square what will the cost of whitewashing if the selling of the room is also whitewashed

Answer 1

Length = 12 m

Width = 8 m

Height = 4 m

Area of four walls = 2(l+b) h

= 2(12+8) * 4

= 8*20

= 160 m^2

Area of celling = 12 * 8

= 96 m^2

Cost of white washing = (160+96) *5

= 256* 5

= Rs 1280

Answer 2

LSA= 2(l+b)h
=2(12+8)4
=40×4
=160m^2

area of the walls is 160m^2

Cost= 160×5
=Rs.800

area of ceiling= 12×8
=96m^2

Cost of Ceiling=96×5
=Rs.480

Total cost=800+480
=Rs.1280