SOLUTION: Justin must average at least 90% on five tests to receive an A. His grades on the first four test were 85%, 93%, 88%, and 94%. Which inequality can justin use to find the minimum p

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Question 441427: Justin must average at least 90% on five tests to receive an A. His grades on the first four test were 85%, 93%, 88%, and 94%. Which inequality can justin use to find the minimum percent score he must make on the fifth test to receive an A?
A.) x-360/5 _<_ 90
B.) x-360/5 _>_ 90
c.) 360+x/5 _<_ 90
d.)360+x/5 _>_90
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
Let x = the score on the 5th test
Then average of the 5 scores is:
(85 + 93 + 88 + 94 + x)/5 = (360 + x)/5
In order to receive an A, the average must be greater than or equal to 90.
Therefore, the inequality is
(360 + x)/5 >= 90
Ans: (d)