Question

The number of rooms on the ground floor of a building is 12 less than twice the number of rooms on the first floor. If the first floor has an ‘x’ number of rooms, write an expression for the number of rooms at the ground floor.

• A. 12 - 2x
• B. 2x – 12
• C. 12x - 2
• D. 2 - 12x

Answer 1

The correct option is B 2x – 12

We know that the number of rooms on the first floor = x

It is given that the number of rooms on the ground floor of a building is 12 less than twice the number of rooms on the first floor.
$\Rightarrow$ Number of room on first floor = 2x
$\Rightarrow$ Number of rooms on ground floor = 2x – 12

Hence, the expression for rooms on the ground floor is 2x – 12.