Question 622921
If a student missed 4 problems on a test and received a grade of 89% and all the problems were equal the same value, how many questions were on the test 
.
Let x = total number of questions
then
(x-4)/x = .89
x-4 = .89x
x = .89x + 4
.11x = 4
x = 4/.11
x = 36.36
or, rounding
x = 36 questions