Question

a studernt has pased 60 percent of 20 quizzes he has written so far successfully. if the student 50 quizzes during the year, and passes 80 percent of the remaning quizzes successfully what is the precent of all the successful quizzess for the entire year

Answer 1

72%

Explanation:

There are a total of 50 quizzes in the year

From the first 20, the student passes 60%. This makes a total of

`(60)/(100) (20) = 12`

12 passes

Out of the remaining 30 quizzes the student passes in 80% of them. This makes a total of

`(80)/(100) (30) = 12`

24 passes

Adding the two values

12 + 24 = 36

The student passes 36 quizzes out of 50.

We convert this to a percentage

`(36)/(50) (100) = 72`%