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)
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168 square feet.
assuming those numbers are in feet: 10 ft * 20 ft = 200 sq. ft.
15 feet by 10 feet is 150 square feet.
3x3 = 9 square feet.
1 sq foot = 0.0929 sq metres. Area of room = 16*12 sq feet = 16*12*.0929 = 17.837 sq metres