Question 829625
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