David,

The subject line of your email was sq ft so my interpretion of your submission is that you want the square footage of a rectangle that measures 15 feet 3 and 5/8 inches by 18 feet 7 inches. First of all 3/8 inches is 3 ÷ 8 = 0.625 inche so 3 and 5/8 inches is 3.625 inches. Since there are 12 inches in a foot this is 3.625 ÷ 12 = 0.302 feet. Thus 15 feet 3 and 5/8 inches is 15.302 feet. Likewise 18 feet 7 inches is 18.583 feet. Therefore the area of a rectangle which is 15 feet 3 and 5/8 inches by 18 feet 7 inches is 15.302 × 18.538 = 284.36 square feet.

Penny