SOLUTION: If your average score on your first six mathematics tests was 84 and your
average score on your first seven mathematics tests was 85, then your score
on the seventh test was
(A)
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Question 248912: If your average score on your first six mathematics tests was 84 and your
average score on your first seven mathematics tests was 85, then your score
on the seventh test was
(A) 86 (B) 88 (C) 90 (D) 91
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
average score on first 6 mathematics tests is 84.
total score on first 6 tests = 6 * 84 = 504
average score on first 7 mathematics tests is 85.
total score on first 7 tests = 7 * 85 = 595
score on your 7th test is 595 - 504 = 91
(504 + 91) / 7 = 85 average on 7 tests.
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