SOLUTION: Three math classes x , y and z take an exam.
i. the average of the classes x, y, and z are 83, 76 and 85, respectively.
ii. the average of classes x and y TOGETHER is 79.
iii.
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-> SOLUTION: Three math classes x , y and z take an exam.
i. the average of the classes x, y, and z are 83, 76 and 85, respectively.
ii. the average of classes x and y TOGETHER is 79.
iii.
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Question 864261: Three math classes x , y and z take an exam.
i. the average of the classes x, y, and z are 83, 76 and 85, respectively.
ii. the average of classes x and y TOGETHER is 79.
iii. the average of classes y and z TOGETHER is 81.
Find the average score for the students of all 3 classes COMBINED. !
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(83x+76y)/(x+y)=79,
(76y+85z)/(y+z)=81,
(83x+76y+85z)/(x+y+z)=w
w=163/2=81.5
