Answer :
Answer:
72 questions
Explanations:
Given the following parameter
Total questions in the test = 80 question
If the student need to get 90% to get a good grade, the number of questions he needs to get right is expressed as:
[tex]\begin{gathered} number\text{ of questions}=90\%\text{ }of\text{ 80} \\ number\text{ of questions}=0.9\times80 \\ number\text{ of questions}=72questions \end{gathered}[/tex]Hence the number of question that you need to get right is 72 questions