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Quantitative Aptitude

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Percentage & Averages

Question
6 out of 20
 

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 =

Percentage & Averages Flashcard List

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