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21 meters is about one-and-one-tenth times as long as a Bowling Lane
In other words, it's 1.096 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.91216 times that amount.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 19.156 m. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
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