SOLUTION: Hello, I could really use some help with this ptoblem, thanks! A student averages 84 on five tests. If the student received grades of 84, 82, 81, and 79 on the first four exams, wh

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Hello, I could really use some help with this ptoblem, thanks! A student averages 84 on five tests. If the student received grades of 84, 82, 81, and 79 on the first four exams, wh      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 54869: Hello, I could really use some help with this ptoblem, thanks! A student averages 84 on five tests. If the student received grades of 84, 82, 81, and 79 on the first four exams, what grade did the student receive on the fifth exam?
Answer by funmath(2933) About Me  (Show Source):
You can put this solution on YOUR website!
A student averages 84 on five tests. If the student received grades of 84, 82, 81, and 79 on the first four exams, what grade did the student receive on the fifth exam?
Let the grade for the fifth exam=x
You find the average by adding all the grades together and dividing by the number of tests.
%2884%2B82%2B81%2B79%2Bx%29%2F5=84
%28326%2Bx%29%2F5=84
5%28326%2Bx%29%2F5=5%2884%29
cross%285%29%28326%2Bx%29%2Fcross%285%29=420
326%2Bx=420
-326%2B326%2Bx=420-326
highlight%28x=94%29
:
Check substitute 94 in for x and see if the student averages 94.
%2884%2B82%2B81%2B79%2B94%29%2F5=84
420%2F5=84
84=84 We're right!!!
Happy Calculating!!!