How many tiles are required to lay out a square wall with a side of 3 m and a tile length of 30 cm and a width of 20 cm.

We are given a square wall with a side of 3 meters.

3 meters is 300 centimeters.

Therefore, the length of the wall = 300 centimeters.

And the width of the wall = 300 centimeters.

The length of one tile = 30 centimeters.

Let’s find how many tiles will be needed to fill the entire length of the wall in one line:

300: 30 = 10 tiles.

The width of one tile is 20 centimeters.

Let’s find how many tiles are needed to fill the entire width of the wall in one line:

300: 20 = 15 tiles.

Well, for the entire wall, we just need to multiply these values:

10 * 15 = 150 tiles.

Answer: You will need 150 tiles.