average marks of x,y,z are calculated.The average score of x,y,z are 83,76,85.Average score of x and y is 79 while average score of y and z is 81.Find average score of all the three students.
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Step-by-step explanation:
According to the given condition
(83x+76y)/(x+y) = 79
on solving x = 3y/4
similarly (76y+85z)/(y+z) = 81
on solving z = 5y/4
average score for all the three classes taken together = 83x+76y+85z/x+y+z
on solving you will get 978y/12y=81.5
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