The area of one room is 12 meters squared, and it is 25% of the area of the entire apartment.

The area of one room is 12 meters squared, and it is 25% of the area of the entire apartment. Find the area of the entire apartment.

The area of one room is 25% of the area of the apartment. This area is known to us in meters. Nothing prevents you from finding the area of the entire apartment simply by making the appropriate proportion. So, 12 meters squared corresponds to 25% of the total area. Question: how many square meters are all 100% of the area? Proportion: 12/25 = x / 100; x = 100 * (12/25) = 48.
Answer: the area of the entire apartment is 48 square meters.