Your test scores in one class are 78 and 86.

Question

Your test scores in one class are 78 and 86.What possible scores can you earn on your next test to have a test average between 82 and 88, inclusive?

Answer 1

To get 82:

 

(78 + 86 + a)/3 = 82

 

Solve for a.

 

To get 88:

 

(78 + 86 + b)/3 = 88

 

Solve for b.  

 

You need to score between a and b, inclusive.