assuming your 15 x 13 is a mearurement in feet, then 195 square feet
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To calculate the square footage of a room, you multiply the length by the width. In this case, a 10 ft by 15 ft room would be 150 square feet. This is because 10 ft x 15 ft = 150 sq ft.
15 feet by 10 feet is 150 square feet.
13ft*15ft = 195 square ft 13 times 15 = 195 as any calculator will tell you (or you can do it in your head - 10 times 15 = 150, 3 times 15 =45 add together = 195)
6 and 2/3 gal.