Question

convert percents, decimals, and fractions
topic: convert percents, decimals, and fractions
progress:
the movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.
choose the option below that accurately describes what it means to get 80% on a test.
the test had 80 problems on it and you got all of them correct.
the test would have to have 100 questions for you to be able to get 80% on it.
if the test had 50 questions on it, you would have correctly answered 30 of the questions.
if the test had 100 questions, you incorrectly answered 20 of them.

Explanation:

Step1: Analyze first option

If test has 80 problems and all correct, percentage is $\frac{80}{80}\times100\% = 100\%$, not $80\%$.

Step2: Analyze second option

Test can have any number of questions. For example, if test has 20 questions, $80\%$ means $\frac{x}{20}\times100\%=80\%$, $x = 16$ (not 100 - question requirement).

Step3: Analyze third option

If test has 50 questions, $80\%$ means $\frac{x}{50}\times100\%=80\%$, $x=\frac{80\times50}{100}=40
eq30$.

Step4: Analyze fourth option

If test has 100 questions, $80\%$ correct means $80$ correct. So incorrect is $100 - 80=20$.

Answer:

If the test had 100 questions, you incorrectly answered 20 of them.