They use math becsuse they were the ones who discovered math like fractions, adding, subtracting, and dividing
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100
If all the same numbers have the same unit then ten
Sure, if you need to figure how many hors'devors to make, based on how many guests the client expects. Etc.
17' x 17' = 204" x 204" 204" / 16" = 12.75 ~^ 13 (stones on each side) 13 stones x 13 stones = 169 stones will cover an area 17' x 17' (You will need to trim the sones on two of the sides to make the area exact.)
12inch x 12inch is 1ft x 1 ft=1 square foot You need 100 patio stones