SOLUTION: 2. Mary’s average on two biology quizzes is 7. What should Mary score on the next quiz in order to have an average of 8 for the three quizzes?
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Question 829625: 2. Mary’s average on two biology quizzes is 7. What should Mary score on the next quiz in order to have an average of 8 for the three quizzes? Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! Mary’s average on two biology quizzes is 7. What should Mary score on the next quiz in order to have an average of 8 for the three quizzes?
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let x=Mary's required score on the next quiz.
(2*7+x)/3=8
14+x/3=8
14+x=24
x=24-14
x=10
Mary's required score on the next quiz=8
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