Question

A hall is 15 m long and 12 m broad. If the sum
of the areas of the floor and the ceiling is equal
to the sum of areas of the four walls, the
volume of the hall is:
(a) 720 (b) 800
(c) 1200 (d) 2000

Answer 1

area of rectangle= l*b
=15*12=180 m2
this is the area of ceiling
area of ceiling and floor = 2 area of ceiling
= 2*180= 360m2
csa of cuboid = 2(l+b)h
360= 2*27*h
360/54=h
6.67m=h
volume of hall= L*B*H
= 15*12*6.67
= 180*6.67
= 1200.6m2
which can be estimated as 1200m2
option C is correct answer

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