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Jane has scores of 84, 92, and 89 on her first 3 exams. What does she need to score on the next exam so that her overall average will be 90?

Question

Jane has scores of 84, 92, and 89 on her first 3 exams. What does she need to score on the next exam so that her overall average will be 90?
Jane has scores of 84, 92, and 89 on her first 3 exams. What does she need to score on the next exam so that her overall average will be 90?

Answers

For the average of 4 exams to be 90
the total of all 4 exams must be #4 xx 90 = 360#

Let fourth exam score be #x#

#84 + 92 +89 + x = 360#
#265 + x = 360#
#x = 95#

She will need to score #95# on her fourth exam to average #90#


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