Question

the length breadth and height of a room are 5m,4m,and 3m respectively .Find the cost of white washing the wall of the room and ceiling at the rate of 7.50 per meter square

Answer 1

Hey dear here is your answer!!!!!

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The length, breadth and height of the room are 5m, 4m and 3m respectively.

The white washing is to be done on the 4 walls and the ceiling only.

TSA of room = 2(lb + bh + hl)

Area of Floor = lb

So, we would find the area to be painted by:-

= TSA of room - Area of Floor

So, the area to be painted would be:-

= 2 (lb + bh +hl) - lb

= 2 [ (5)(4) + (4)(3) + (3)(5) ] - (5)(4)

= 2 (20 + 12 + 15) - 20

= 2(47) - 20

= 94 - 20

= 74 cm²

The rate of white washing per m² is ₹7.50

So, the cost for white washing 74m² would be:-

= 7.50 x 74

= ₹555

So, the cost would be ₹555 !

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❣️⭐ Hope it helps you dear...⭐⭐❣️❣️

Answer 2

HEY Buddy.....!! here is ur answer

Given that....

The length , breadth and height of a room 5m, 4m and 3m respectively.

As we know that.....Curved surface area of the room = 2h(l+b)
and for ceiling the are = lb

So total are to washing the wall and ceiling = 2h(l+b) + lb

=> 2×3(5+4) + 5×4

=> 6×9+20

=> 54+20

=> 74 m²

Also given that...the cost to washing and ceiling per m² = 7.50 Rs.

Then, total cost = 7.50 × 74

= 555 Rs.

I hope it will be helpful for you....!!

THANK YOU ✌️✌️

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