Verified Answer :

the length of one full turn is the same as it's circumference.

circumference x turns = total length

to find the number of turns, you have to divide total length by it's circumference.

423 / (7 5/6) = 423 / (47/6)
= 54

75/6=12.5
and it will rotate 33.84 times to complete 423 ft

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