# The width and length of the room is 10 and 90 meters, and the length and width of the planks are 20 and 10 cm.

The width and length of the room is 10 and 90 meters, and the length and width of the planks are 20 and 10 cm. Find how many planks you need to cover the floor of the room.

1) Let’s find out what area the room has with sides of 10 m and 90 m.

10 * 90 = 900 m².

2) We find out what area the boards have, if it is known that their length is 20 cm and the width is 10 cm.

20 * 10 = 200 cm².

200 cm² = 0.02 m².

3) Find out how many planks will be required to cover a floor of 900 m², if it is known that the area of the planks is 0.02 m².

900 / 0.02 = 45,000 plaques.

Answer: To cover a 900 m² floor you need 45,000 0.02 m² planks.

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