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The area of four walls of a room is 120 ...

The area of four walls of a room is 120 m . The length of the room is twice its breadth. If the height of the room is 4 m, what is area of the floor ?

A

`40 m^(2)`

B

`50 m^(2)`

C

`60 m^(2)`

D

`80 m^(2)`

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