One tile is 20 cm long.How many tiles are needed for a 4 m row

4m = 400cm

Where 1 tiles = 20cm
x tiles = 400cm
Now you cross multiply
X x 20 = 1 x 400
20x/20 = 400/20
X = 20 tiles

21

To find out how many tiles are needed for a 4 m row, we need to convert the length of the row from meters to centimeters since the length of the tile is given in centimeters.

1 meter = 100 centimeters

So, the length of the 4 m row is:

4 meters * 100 centimeters/meter = 400 centimeters

Now, we can divide the length of the row by the length of one tile to find out how many tiles are needed:

400 centimeters / 20 centimeters = 20 tiles

Therefore, you would need 20 tiles for a 4 m row.