Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the
cost of white washing the walls of the room and the ceiling at the rate of
Rs 7.50 per m².
​

Answer 1

Answer:

Area of 4 walls of room= 2 h (l+b)

=2x 3(5+4)

=54 sq.m

Area of ceiling=lxb

=5×4 =20 sq.m

Area of whitewashing=54+20=74sq.m

Cost of whitewashing=7.50×74=Rs 555

Answer 2

Hey Mate ! Here is Your Answer

Given :

• Length = 5m
• Breadth = 4m
• Height = 3m

To Find :

• Cost Of White Washing Walls Of The Room At the rate Rs 7.50/m²

Solution :

First We've to find the Surface Area (S.A) of the room

S.A of the room = 2LB+2BH+2HL

S.A = ( 2*5*4 + 2*4*3 + 2*3*5 ) m²

= ( 40 + 24 + 30 ) m²

= 94 m²

[ Cost Of Per m² = Rs 7.5 ] (Given)

Hence, Cost of 94 m² = 7.5 * 94 = Rs 705

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