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Mathematics 7 Online
OpenStudy (anonymous):

7 students got 65% in test. First three got 75% and last three got 45%.So what is the %age of 4th student???

OpenStudy (dumbcow):

avg = sum/N --> 65 = (3*75 + 3*45 + X)/7 solve for X

OpenStudy (anonymous):

thanks...!

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