Question

Suppose that you are taking a course that has 4 tests. The first three tests are for 100 points each and the fourth test is for 200 points. To get an b in the course, you must have an average of at least 80 percent on the 4 tests. Your scores on the first 3 tests were 72, 84, and 74. What is the minimum score you need on the fourth test to get an b for the course?.

Answer 1

You need an minimum score of 170 on the fourth test to get an b for the course.

Explanation

The first three tests are for 100 points each and the fourth test is for 200 points. So the total points in 4 tests $=(100*3)+200= 500$

To get an b in the course, you must have an average of at least 80% on the 4 tests. So, the minimum score needed to get an b : $(0.80*500)= 400$

Your scores on the first 3 tests were 72, 84, and 74.

So, the minimum score you need on the fourth test will be: $400-(72+84+74)=400-230= 170$