SOLUTION: Eighty percent of students in a math class passed the midterm exam. If 16 students passed the midterm exam, how many students in the class did not pass the exam?

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Question 387857: Eighty percent of students in a math class passed the midterm exam. If 16 students passed the midterm exam, how many students in the class did not pass the exam?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

given:
80%=0.8 ...passed the midterm exam

first find x, the number of students in a class:
16 students passed...=>....0.8%28x%29=16
x=16%2F0.8
x=20....there were 20 students in a class
so, 20-16=4 ...........4 students did not pass the exam