Arectangular floor is 21 feet long and 9 feet wide

For this case we have that the area of the rectangle is given by:

Where:

a: It is the length of the rectangle

b: It is the width of the rectangle

According to the data we have to:

Replacing the data we have:

Finally, the floor area is

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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