Question

The number of rooms on the ground floor of a building is 12 less than the twice of the number of rooms on first floor. If the first floor has x rooms, how many rooms does the ground floor has?

Answer 1

Let the number of rooms on the ground floor be y.

It is given that the ​number of rooms on the first floor is x; therefore, we have:

y = 2 $\times$ x $-$ ​12
= 2x $-$ 12

Thus, the number of rooms on the ground floor is 2x $-$ 12.