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The number of rooms on the ground floor of a building is $12$ less than twice of the number of rooms on first floor. If the first floor has $x$ rooms, from the following choices, find the number of rooms of the floor.

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2 x + 12

x + 12

2 x − 12

x − 12

answer is C.

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Detailed Solution

Given that, the first floor has

x

number of rooms.
Twice of the rooms on first floor

= 2 x

.
Since the room of ground floor is

12

less than twice the number of rooms on the first floor, so put a negative sign between them.
The rooms on the ground floor is given by the expresson,

2 x − 12

The number of rooms on ground floor is

2 x − 12

.
Hence, option 3) is correct.

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