3 B) raghu Spends is 441 on painting a square wall of the cost of painting the wall is to 2.25 per m2i find the perimeter of Square wall .
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Let l, b and h be the length, breadth and height of the room.
The four walls of the room are to be painted.
Area of the two walls containing the length =2lh
Area of the two walls containing the breadth =2bh
Total area of four walls=2lh+2bh
=h×2(l+b)
But 2(l+b) means the perimeter of the floor of the room.
Total area of walls =25×h sq.m. ....(i)
Total area of walls =Rate of paintingTotal cost of painting=10750
Total area of walls=75sq. m. ...(ii)
Equation (i) = equation (ii)
25h=75
∴h=3m
Thus, the height of the room is 3m.
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i hope my answer us correct thank you
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