SOLUTION: Test scores: Your test scores are 71,75,82,and 86. What is the lowest grade that you can get on the next test and still have an average score of at least 80? What I did was:

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Test scores: Your test scores are 71,75,82,and 86. What is the lowest grade that you can get on the next test and still have an average score of at least 80? What I did was:       Log On

 

Hi

'Average' = (71+75+82+86+s)/5

(71+75+82+86+s)/5 ≥ 80

(71+75+82+86+s)≥ 5*80

             s ≥ 400-314

             s ≥ 86