A square room has a tiled floor with 225 square tiles. How many tiles are along an edge of the room?

15

Step-by-step explanation:

Tiled floor with 225 square tiles means the area of the square room is 225.

Formula needed: A = (side)^2 or in short

A = s^2.

We need to find s.

225 = r^2

sqrt{225} = sqrt{r^2}

15 = r

There are 15 tiles are along an edge of the room.