To cover this area you will need about 10.87 square meters of material.
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If you have an eight square foot area, and the tiles are 112x12-inches, you will need eight. If what you meant to say was an eight foot square area, that would be 64 square feet, and you would need 64 tile. Sorry! In the first line above should read, "...and the tiles are 12x12-inches..."
Nine in each square foot. (27 times 9 equals 243).
Well, darling, 16 multiplied by 10 gives you 160 square meters. It's as simple as that. No need to overcomplicate things, honey.
You need 100W per square meter. 100W equals around 341.3BTU. 1 square meter are around 10.7 square feet. You therefore need around 32 BTU per square foot.