SOLUTION: After six biology tests, Ruben has a mean score of 78. What score does Ruben need on the next test to raise his average to 80? --I am confused on how to set this up and get it s

Question 679277: After six biology tests, Ruben has a mean score of 78. What score does Ruben need on the next test to raise his average to 80?
--I am confused on how to set this up and get it started. Is there a formula I need to use?
Thanks!
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
x is the total score on the first six tests.
...

x = 468
...
y is the score needed on the next test
...

468+y = 560
y = 560-468
y = on the next test
.....................
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