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The floor is 5m long and 4m wide. A square carpet is laid on the floor. Find the area of the floor that is not carpeted.

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22 square meters

20 square meters

11 square meters

10 square meters

answer is C.

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Detailed Solution

Concept- First, find the floor area using the rectangular area formula. Then find the area of the square covering you want to lay. Therefore, subtract the carpet area from the floor area.
Question Image

First, you can calculate the area of the floor on which the carpet will be laid. To calculate the floor area, use the rectangular area formula

Where,

Now to calculate the area of floor substitute the l and b values in the area formula We get:
Question Image

To find the area of square carpet Question Image

Now, to calculate the area left :
Question Image

Hence, the correct answer is option (3).

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