my average is 85 what do I need on final to average 90

Question

my average is 85 what do I need on final to average 90

Answer 1

Assuming the final exam doesn't carry more weight, you can use a simple algebraic equation:

 

(85 +X)/2 = 90

 

Multiply both sides by 2 to get rid of the fraction: 85+x = 180

 

subtract 85 from both sides to find the answer: x = 95