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Are you serious?! 12 inches in a ruler, 12x2=24 inches.A more truthful answerBetween 2 and 10,000 Rulers come in sizes between 1 inch and I have seen folding rulers 15 or more feet long
There is no direct relationship between the kind of economy and the number of rulers.
It depends: 8, 10, 16, 32 and, in precision rulers, 64.
20 rulers
It would take about 21 foot rulers.