1.  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 the areas of four walls, the volume of the hall is:
A. 720
B. 900
C. 1200
D. 1800

Answer: Option C

Explanation:

2(15 + 12) x h = 2(15 x 12)

h = 180 m = 20 m.
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Volume = 15 x 12 x 20 m3 = 1200 m3.
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