The average of your first 6 tests is 82. If your test average after your seventh test is an 80.5, what did you score on the seventh test?
Question 2 options:

So average is  of the first 6 tests is 82   well that means 
(test1 + test2+ test3+ test4 + test5+test6)/6 = 82
so now let do some cross multiplliying 
test1 + test2 + test3 + test 4 + test5 +test6 = 82*6
test1 + test2 + test3 + test 4 + test5 +test6  = 492
now lets see if we can find that 7th test score
(test1 + test2 + test3 + test4 + test5 +test6 + test7)/7 = 80.5
So look we found test1 + test2 + test3 + test4 + test5 +test6 to be 492 so lets substitute.  
(492 + test7 )/7 = 80.5
test7 = (80.5*7)-492 = 71.5 


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