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A backstroke swimmer on the Brown Middle School swim team is required to spend at least 70% of his or her total laps practicing backstroke. The following table shows the total laps and number of backstroke laps for 5 swimmers.

User Books
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there is no table so I cannot help you other than to say
to find the answer multiply the time swimming of each participating swimmer by .7 and you shall get your time.
User Matthew Gillingham
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