ANSWER
B 150
EXPLANATION
Let the total number of questions that were on the exam be x.
Since Ginger earned a score of 82% and answered 123 correctly, this means that 82% of x is 123.
That is:
[tex]\begin{gathered} \Rightarrow\text{ }\frac{82}{100}\cdot\text{ x = 123} \\ \text{Divide both sides by 82 and multiply by 100:} \\ x\text{ = }\frac{123\cdot\text{ 100}}{82} \\ x\text{ = 150} \end{gathered}[/tex]Therer were 150 questions on the exam.
