SOLUTION: Alissa has test grades of 90, 87, and 79 on her first three algebra tests. If she wants an average of at least 80 after her fourth test, what are the possible scores she can make o

Question 888613: Alissa has test grades of 90, 87, and 79 on her first three algebra tests. If she wants an average of at least 80 after her fourth test, what are the possible scores she can make on the fourth test?
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Alissa has test grades of 90, 87, and 79 on her first three algebra tests. If she wants an average of at least 80 after her fourth test, what are the possible scores she can make on the fourth test?
.
Let x = score on fourth test
then
(x+90+87+79)/4 >= 80
(x+256)/4 >= 80
x+256 >= 320
x >= 64
The score on her fourth test must be "greater than or equal" to 64

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