Question 256023
Tom has taken 5 of the 8 equally weighted tests in his U.S. History class this semester, and he has an average score of exactly 78.0 points. How many points does he need to earn on the 6th test to bring his average score up to exactly 80.0 points?
---------------
Let the 6th test score be "x".
Equation:
Total points from the 1st 5 tests is 5*78 = 390
To solve for "x":
(390+x)/6 = 80
390 + x = 480
x = 90
He need a 90 on the 6th test.
===========
Cheers,
Stan H.
 
A. 90 B. 88 C. 82 D. 80 E. 79