To pass a course with a B grade, a student must have an average of 80 or greater. A student’s grades on three tests are 73, 86, and 78. Find what score the student must get on the next test to get a B average or better. What grade must the student get? ___ or greater.
To pass a course with a B grade, a student must have an average of 80 or greater. A student’s grades on three tests are 73, 86, and 78. Find what score the student must get on the next test to get a B average or better. What grade must the student get? ___ or greater.
Call the required minimum grade on the next test x
After having taken the next test, i.e., the fourth test, the student wants an average of 80.
the scores he has made ..... 73 + 86 + 78 + x
divided by .... ———————— equals 80
the total number of tests ..... 4
this relationship is x + 237 / 4 = 80
multiply both sides by 4 x + 237 = 320
subtract 237 from both sides x = 83
The student must score 83 on the fourth test to have an average of 80.
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