SOLUTION: 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

Algebra ->  Equations -> SOLUTION: 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      Log On


   



Question 181058: 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 83, 75, and 91. What is the minimum score you need on the fourth test to get an B for the course?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I'll call the points scored on the tests a, b, c, and d
Points scored on a, b, and c are:
83+%2B+75+%2B+91+=+249
The total possible points for the 4 tests are
3%2A100+%2B+200+=+500
In order to average 80%,
%28249+%2B+d%29%2F500+=+.8
249+%2B+d+=+.8%2A500
d+=+400+-+249
d+=+151
You must score 151 points out of 200 to get a B