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OpenStudy (anonymous):
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?
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OpenStudy (campbell_st):
well the total of the 1st 6 tests is 6 x 82 so average of the 7th test is 80.5 so 80.5 = (6 x 82 + S)/7 solve for s... that is the score in the 7th test
OpenStudy (anonymous):
how do you solve for s
OpenStudy (campbell_st):
multiply both sides of the equation by 7... then subtract (6 x 82) from both sides of the equation
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