Middle School

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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 :

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

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Rewritten by : Barada

Final answer:

Sue's bedroom measures 180 square feet, and she requires 20 BTUs per square foot, resulting in a need for an air conditioner with at least 3600 BTUs.

Explanation:

Sue needs to calculate the number of British thermal units (BTUs) required to cool her bedroom, which is necessary for selecting the right air conditioner. To find the number of BTUs required:

  1. Multiply the length of the room by the width to find the area in square feet.
  2. Her bedroom measures 15 feet by 12 feet, so the area is 180 square feet.
  3. Next, multiply the area by the BTUs needed per square foot. In this case, 20 BTUs per square foot is recommended.
  4. Therefore, 180 square feet × 20 BTUs/square foot equals 3600 BTUs.

Sue will need an air conditioner capable of cooling with at least 3600 BTUs.