Question

A hall is 30 m long, 20 m wide and 8 m
high. What is the cost of whitewashing its
four walls and ceiling at 15 per metre square ?​

Answer 1

Step-by-step explanation:

Area of wall =2( l+b) h

2 *50*8= 800m square

1 m square = 15

15 *800 = 12000

Answer 2

Answer:

hey nef

2(l+b)h +  lb  ( lb for ceiling )

2 ( 30 + 20) 8 + 30 x 20

16 x 50 + 600

800 + 600

= 1400 m2

cost of white washing per m2 = 15 . RS

rate of white washing per 1400m2  =  1400 x  15

                                                          =  21,000 . RS