SOLUTION: in an English class, each student's final grade is the average of the scores on n tests. If Lisa makes a 97 on the last test, her grade will be 90. If she makes a 73 on the last t

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Question 1051059: in an English class, each student's final grade is the average of the scores on n tests. If Lisa makes a 97 on the last test, her grade will be 90. If she makes a 73 on the last test, her grade will be exactly 87. What is the value of n?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28S%2B97%29%2Fn=90
S%2B97=90n
1.S=90n-97
and
%28S%2B73%29%2Fn=87
S%2B73=87n
2.S=87n-73
Equate 1 and 2 and solve for n.
90n-97=87n-73
3n=97-73
3n=24
n=8