SOLUTION: a student misses 7 problems on a chemistry test and received a grade of 85%. If all the problems were of equal value, how many problems were on the test?

Question 814188: a student misses 7 problems on a chemistry test and received a grade of 85%. If all the problems were of equal value, how many problems were on the test?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
((n - 7)/n) * 100 = 85
(n - 7)/n = 0.85
n - 7 = 0.85n
0.15n = 7
n = 7/0.15
n = 46.6666666
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Answer:
because a test cannot have a fractional number of questions, we round n up to the next integer, so:
n = 47
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Check:
(40/47)*100 = 85.10638
so the teacher must have rounded the student's score to the nearest percent.
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