A class contain 8 male students and 12 female students if the average score of the entire class for a certain exam is 70 and the average score of the male students in the same exam is 55 what is the average score of the female students?
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Answer:
Let x be the average score for female students.
Equation:
(8*55+12x)/20 = 70
440+12x = 1400
12x = 960
x = 80
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