Count the number of squares in the figure corresponding to Q.79 in image_146f63.png.

Let us count the squares by analyzing the structure shown in Q.79 of image_146f63.png:
The figure consists of 3 concentric squares (an inner square, a middle square, and an outer square) that share a common center. A horizontal line and a vertical line pass through the center, bisecting all three squares.

For each of the concentric squares, this central cross divides it into 4 smaller individual squares. Thus, for any single concentric square, we have:

* 4 small individual squares formed by the division.
* 1 large outer boundary square.

This gives a total of $4+1=5$ squares per concentric structure.

Since there are 3 such concentric structures nested together:

$$\text{Total number of squares}=3\times 5=15$$