Question

On a 50 question quiz that Ms. Marshall gave, one student received a 70%. How many questions did the student get wrong?

Answer 1

If the student got 70 percent right, he got 30 % wrong

50 *.3 = 15

He got 15 wrong

Answer 2

Total number of questions were 50.

One student got 70% of questions correct.

The percentage of questions the student got wrong was 100% - 70% = 30%

The number of questions the student got wrong were 30% of 50 which is;

$\frac{30}{100}$ × 50 = $\frac{1500}{100}$ = 15 questions.

The student got 15 questions wrong.