Question

A rectangular tank which is 25m long ,20 m wide and 10 m high . find the cost of painting it outer surface at 3 rs /sq meter

Answer 1

:area of a cuboid is: 2{lb+bh+hl} .
so area of the tank is2{500+250+200}
i.e.=2{950}
    =1900m sq.

Answer 2

C.S.A of cuboid -2(l+b)×h

2(25+20)×10