In a three-room apartment, the area of the first room is 18 m2, and the area of the second is 7 m2 more than the first.

In a three-room apartment, the area of the first room is 18 m2, and the area of the second is 7 m2 more than the first. The area of these two rooms is 19 m2 more than the area of the third room. What is the area of the third room?

Let’s calculate the area of the second room in the apartment. Add to the area of the first room – 18 m² 7 m²:

18 + 7 = 25 m².

The area of the second room is 25 m².

Let’s calculate the area of the first and second rooms combined. Let’s add to the area of the first room – 18 m² the area of the second room – 25 m².

18 + 25 = 43 m².

The area of two rooms is 43 m².

Let’s calculate the area of the third room. Subtract from the area of two rooms – 43 m² 19 m²:

43 -19 = 24 m².

The area of the third room is 24 m².

Answer: the area of the third room is 24 m².