Question

length,breadth and height of a rectangular tank are 25m,20m and 10m respectively.
find the cost of painting its outer surface at Rs 3 per sq.m

Answer 1

Hii There!!!


In the question it is given that: l = 25m , b = 20m , h = 10m


Since, we know that total surface area of a rectangle = 2 [lb + bh + hl ]

=> 2 × [ 25 × 20 + 20 × 10 + 10 × 25 ]

=> 2 × [ 500 + 200 + 250 ]

=> 2 [950]

=> 1900 m^2


So, total surface area of rectangular tank is 1900m^2.


Now, cost of painting the tank :-

= 1900 × 3 = 5700 /-


Hence, cost will be 5700 Rs.



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Hope it helps :)

Answer 2

surface area = 2 (lb+bh+hl)
=2 (25×20+20×10+10×25)
=2 (500+200+250)
=950×2
=1900



cost of painting = total surface area×cost of painting 1sq.m

=1900×3
=5700rupes