Question

Sue wants to buy an air conditioner for her bedroom. She has been told that the air conditioner needs to have 20 BTUs (British thermal units) per square foot to cool her bedroom. Her bedroom measures 15 feet by 12 feet.
Enter the number of BTUs needed to cool her bedroom.

Answer 1

Answer:   3600 BTUs

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Work Shown:

Area of rectangle = length*width

A = L*W

A = 15*12

A = 180

Sue's bedroom has floorspace of 180 square feet.

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1 square foot = 20 BTUs required

180*(1 sq ft) = 180*(20 BTUs) ... multiply both sides by 180

180 square feet = 3600 BTUs required