A yard is three feet.
SO.
if 3ft = 1yd
then 9ft² = 1yd²
the equation would look like this
640/9 = 71.11111...yd²
You get ~71.1 SQUARE yards of carpet... if that's what you're looking for
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You need 166.66 square yards of carpet.
55 yards of carpet is 495 square feet. 55 x 9 = 495
900 square feet.
630
828