SOLUTION: In a certain course, Amy received an average (arithmetic mean) score of 84 for her first 2 tets, 78 for her third test, and 94 for her fourth test. What grade must she receive on h

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> SOLUTION: In a certain course, Amy received an average (arithmetic mean) score of 84 for her first 2 tets, 78 for her third test, and 94 for her fourth test. What grade must she receive on h      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 463421: In a certain course, Amy received an average (arithmetic mean) score of 84 for her first 2 tets, 78 for her third test, and 94 for her fourth test. What grade must she receive on her next test if she wants an average of 87 for all 5 tests?
Answer by alicealc(293) About Me  (Show Source):
You can put this solution on YOUR website!
(84 * 2 + 78 + 94 + x)/5 = 87
168 + 78 + 94 + x = 87 * 5
340 + x = 435
x = 435 - 340 = 95

so, she must receive 95 for the next test