SOLUTION: On the first 4 tests of her language class, Vanessa got an average score of 85. What does she need on the next test to have an overall average of 87?

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Question 924123: On the first 4 tests of her language class, Vanessa got an average score of 85.
What does she need on the next test to have an overall average of 87?

Found 2 solutions by ewatrrr, TimothyLamb:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
%284%2A85+%2B+x%29%2F5+=+87
x = 435 - 340 = 95

Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
assume that each of the 5 tests is worth 20% of the overall grade:
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0.8*85 + 0.2x = 87
68 + 0.2x = 87
0.2x = 87 - 68
x = (87 - 68)/0.2
answer:
x = 95
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