SOLUTION: After taking 5 quizzes your average is 72 out of 100. What must your average score be on the next 5 quizzes to increase your average to 79. Write an equation and solve.\ Please ex

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Question 982237: After taking 5 quizzes your average is 72 out of 100. What must your average score be on the next 5 quizzes to increase your average to 79. Write an equation and solve.\
Please explain how to do this
Thank you.
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
.
Average is total points/number of quizzes.
Let x=total points:
72=x/5 quizzes
72*5=x
360=x Total points is 360
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To average 79 on 10 quizzes:
79=x/10
79*10=x
790=x Total points to average 79 on 10 quizzes is 790.
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If you have 360 points and you need 790 points, you must score 430 points in the next 5 quizzes, for an average of:
430 points/5 quizzes=86 points/quiz.
ANSWER: You must average 86 on the next 5 quizzes to have an overall average of 79.