SOLUTION: A student missed 5 problems on a history test and received a grade of 89% if all the problems were of equal value, how many problems were on the test. round off your answer to the

Algebra ->  Average -> SOLUTION: A student missed 5 problems on a history test and received a grade of 89% if all the problems were of equal value, how many problems were on the test. round off your answer to the       Log On


   

Question 832434: A student missed 5 problems on a history test and received a grade of 89% if all the problems were of equal value, how many problems were on the test. round off your answer to the nearest integer
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = the number of problems on the test
+x+-+5+ is the number answered correctly
+%28+x-5+%29+%2F+x+=+.89+
+x+-+5+=+.89x+
+.11x+=+5+
+x+=+5%2F.11+
+x+=+45.45+
There were 45 problems on the test
check:
The student missed 5, so 40 were answered correctly
+40%2F45+=+.888+
close enough