If his overall average for the online test was 75%, how many questions were on the test?

Question

After completing part of an online test, Chris had correctly answered 80% of the questions he'd attempted. Then, he answered 13 of the remaining 20 questions.

Answer 1

since the student completed 80% of the first part of the questions and then completed another 20 questions to complete the exam. Therefore, the number of the first part of the questions = x-20 (total number of questions (x) - the last 20 questions)

 

0.8(x-20)+13=0.75x

0.05x=3 -----> x =60

 

Total Number of questions in the test = 60 questions