SOLUTION: In Mr. Johnson’s social studies class, the class average on a test was 90%. He has 25 students in the class, and only three students failed. If the 23 passing students averaged 93%

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Question 944022: In Mr. Johnson’s social studies class, the class average on a test was 90%. He has 25 students in the class, and only three students failed. If the 23 passing students averaged 93% on the test, what did the three failing students average?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
In Mr. Johnson’s social studies class, the class average on a test was 90%.
He has 25 students in the class, and only three students failed.
If the 23 passing students averaged 93% on the test, what did the three failing students average?
:
let f = average of the 3 failed students
%28%2823%2890%29+%2B+3f%29%29%2F25 = 90
multiply both sides by 25
23(90) + 3f = 25*90
2070 + 3f = 2250
3f = 2250 2070
3f = 180
f = 180/3
f = 60% is the av of the failed students