Question

If 30 students took an exam and 10 of them failed, what percent of them of passed?

Answer 1

If 30 students took an exam and 10 of them failed, to find out what percentage of them passed, we first need to find out how many people passed. Since there are a total of 30 students, and 10 of them failed, since the only other option is passing, we need to subtract the number of students that failed from the total number of students. 30 - 10 = 20, so 20 students passed. To find out what percent of the students passed, we need to find out what percent of the total number of students 20 is. We can do this by dividing the number of students that passed (20) by the total number of students (30), and then multiplying by 100 to make it a percent. 20/30 = 2/3 = 0.667. 0.667 * 100 = 66.667... percent.

Answer 2

30 students took an exam. 10 of the students that took the exam failed so 20 students who took the exam passed.

The fraction
`(20)/(30)` represents the number of students who passed it out of all the students that took the exam.

The fraction
`(20)/(30)` can be reduced to
`(2)/(3)` by dividing both the numerator and denominator by the greatest common factor of 20 and 30 which is 10.

2 ÷ 3 = 0.66666666666667

0.66666666666667 × 100 = 66.666666666667%

66.666666666667% of the students passed the exam.