How many 18x18 tiles equal 170 square feet?
Your 1 st 2 answers are wrong or partly wrong. 18x18 tile is 324 square inches, divide by 144 ( 1 s/f) and you get 2.25 s/f per tile. Divide that into the 15x11 area(which is 165 s/f) You get 73.33 tiles or a bare minimum of 74 tile. I would most definitely get 7/10 extra tile to cover scrapes and cuts. You may need more or less depending on your layout and pattern you put in ( if any). Any questions you can e mail me through my avatar and check my qualifications there. GL
First of all, your calculation is wrong. You have 165 Sq Ft' Second of all 18(18) does not = 18 The correct answer is 18(18)=324Sq.inches.=2.7 2.7 div.165=61. You will need approx.65 tiles.
Rob S has the only correct answer. My only additional comment is that you should allow for more waste. I would order 90 tiles.
18 x 18 = 18 sq in. which = 1.5 sq ft. 170 / 1.5 = 113.3 Buy about 130 of them, you'll have to cut some of them to get them to fit. Wouldn't hurt to buy 150 just in case.