Quantitative Aptitude
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Percentage & Averages
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Three class A, B, C of Bank Power gave math test. The average score of class A is 83. The average score of class B is 76.the average score of class is C is 85.The average score of class A and B is 79 and average score of class B and C is 81 years. What is the average score of class A, B and C.
A  80 
B  81.5 
C  84.3 
D  85.5 
E  None of these

Ans. B Let the student be x, y, z in 3 class
So total score of A is 83x,B is 76y,C is 85 z
Now
83x + 76y = 79x + 79y
5x = 3y
X = y
Again
76y + 85z = 81y + 81z
4z = 5y
Z = y
Average =
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