SOLUTION: rex scores of 85,92,87,88 and 91 on first five exams. what score must he make on the sixth exam to have an avg of 90 or better for all six exams?

Question 121901: rex scores of 85,92,87,88 and 91 on first five exams. what score must he make on the sixth exam to have an avg of 90 or better for all six exams?
Answer by jainenderkapoor(61) (Show Source): You can put this solution on YOUR website!

rex scores of 85,92,87,88 and 91 on first five exams. what score must he make on the sixth exam to have an avg of 90 or better for all six exams?
Suppose the marks scored in sixth exam = x
We have (85 + 92 + 87 + 88 + 91 + x)/6 >= 90
(443 + x) >= 90*6
x >= 540 - 443
x >= 97 ------> Answer
Rex has to score 97 or more in the sixth exam to get average of 90 or better.

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