Question

the length breath and height of a room is 5m ,4m ,3m respectively .find the cost of whitewashing walls of room and selling it at the cost of 7.50 per msq
give with full explanation no faltu answer required ​

Answer 1

Answer:

hello nice to meet you again the answer is

Explanation:

Area to be whitewashed does not include the floor.

Therefore, area to be whitewashed

= Area of four walls + area of the ceiling

= 2 (/+ b) x h + /x b =

= [2 (5 + 4) x 3 + 5 x 4] m

=54 + 20 m2

74 m2 =

Cost of white washing = Rs 7.50 x 74 = Rs 555

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Answer 2

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Length, breadth and height of a room are 5 m, 4 m and 3 m.

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

=2×3(5+4)

=6(9)

=54 sq m

Area of the ceiling =l×b

=5×4

=20 sq cm.

Total area of the four walls and the ceiling of the room

=54+20

=74 sq cm

Cost of white washing = Rs 7.50 per sq m

Total cost of white washing =74×7.50= Rs 555