It's whatever 12x22 equals :)
264 of them. Get extra for breakage.
12 feet times 22 feet = 264 square feet
2x132= 264 .... 3x88=264 .... 4x66=264 ... 6x44=264 ... 12x22=264
The answer depends on the units used for 12 and 22. Feet, yards, metres? Who knows?
I have a 12x22 on my 50 hp merc-2010 model , pushing a 20 ft. Toon. Does great.