Question 683749

On your first four tests, you scored 80%, 76%, 99%, and 91%. What do you have to get on the final test to average at least an 80% for the course?


Let the grade on 5th and final test be F
Then: {{{(80 + 76 + 99 + 91 + F)/5 >= 80}}}


{{{(346 + F)/5 >= 80}}}


{{{346 + F >= 400}}} ----- Cross-multiplying  


{{{F >= 400 - 346}}}


{{{highlight_green(F >= 54)}}}


In order to have at least an average of 80%, a score of 54% or more has to be attained on the final test.


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