Answer :
Let's begin by listing out the information given to us:
Number of rooms = 7
Dimension of each room = 12 * 15
The amount of living space in the house is given by the product of the number of rooms by the dimension of each room:
[tex]\begin{gathered} A=7\cdot(12\cdot15)=7\cdot180 \\ A=1260unit^2 \end{gathered}[/tex]