Question:A hall is `15` m long and `12` m broad. The sum of the areas of the floor and the ceiling is equal to the sum of areas of the areas of the four walls. The volume of the hall is : 

A `1200 m^3` 
B `1800 m^3` 
C `900 m^3` 
D `720 m^3` 

+ Answer
A 

+ Explanation
`2(15 + 12) xx h`

`= 2(15 xx 12)`

`or h = 180/27 m`

`= 20/3 m.`

:. Volume 

`= (15 xx 12 xx 20/3) m^3`

`= 1200 m^3.`

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Irin Moni

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