SOLUTION: During swim team practice, Ruth swam the 100-yard race 3 times. Her fastest time was 52.3 seconds. Her slowest time was 56.3 seconds. Ruth's average time was 54.0 seconds. Expl

Algebra ->  Algebra  -> Average -> SOLUTION: During swim team practice, Ruth swam the 100-yard race 3 times. Her fastest time was 52.3 seconds. Her slowest time was 56.3 seconds. Ruth's average time was 54.0 seconds. Expl      Log On

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Question 52119: During swim team practice, Ruth swam the 100-yard race 3 times. Her fastest time was 52.3 seconds. Her slowest time was 56.3 seconds. Ruth's average time was 54.0 seconds. Explain how to determins Ruth's time for the third race.
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
(52.3+X+56.3)/3=54 OR (108.6+X)/3=54 OR 108.6+X=162 OR X=162-108.6 OR X=53.4
PROOF (52.3+53.4+56.3)/3=54 OR 162/3=54 OR 54=54