Write the equality and conversion factors, and identify the numbers as exact or give the number of significant figures for each of the following:
a. One yard is 3 ft.
b. One kilogram is 2.205 lb.
c. One minute is 60 s.
d. A car travels 27 mi on 1 gal of gasoline.
e. Silicon makes up 48% of the Earth’s crust.
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