SOLUTION: After 4 tests this term Jessica had a 72% average. He has 2 more tests left in the term. What average score will Jessica need on the final 2 tests to bring his average to 80%

Algebra ->  Percentages: Solvers, Trainers, Word Problems and pie charts -> SOLUTION: After 4 tests this term Jessica had a 72% average. He has 2 more tests left in the term. What average score will Jessica need on the final 2 tests to bring his average to 80%      Log On


   

Question 606534: After 4 tests this term Jessica had a 72% average. He has 2 more tests left in the term. What average score will Jessica need on the final 2 tests to bring his average to 80%
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
After 4 tests this term Jessica had a 72% average.
He has 2 more tests left in the term.
What average score will Jessica need on the final 2 tests to bring his average to 80%
:
This means he will have a total of 6 tests
Let x = average grade on the final two tests
:
%28%284%2872%29+%2B+2x%29%29%2F6 = 80
multiply both sides by 6
4(72) + 2x = 6(80)
288 + 2x = 480
2x = 480-284
2x = 192
x = 192/2
x = 96% av on the last two tests