SOLUTION: After taking 3 quizzes, your average is 79 out of 100. What must your average score be on the next five quizzes to increase your average to 84?

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Question 297439: After taking 3 quizzes, your average is 79 out of 100. What must your average score be on the next five quizzes to increase your average to 84?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the sum of the first 3 quiz scores
given:
x%2F3+=+.79
x+=+2.37
Let y = the sum of the last 5 quiz scores
%282.37+%2B+y%29%2F%285+%2B+3%29+=+.84
2.37+%2B+y+=+.84%2A8
y+=+6.72+-+2.37
y+=+4.35
4.35%2F5+=+.87
The average score of the last 5 quizes is 87%