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Three maths classes : X, Y and Z, take a...

Three maths classes : X, Y and Z, take an algebra test. The average score of class X is 83. The average score of class Y is 76. The average score of class Z is 85. The average score of class X and Y is 79 and average score of class Y and Z is 81. What is the average score of classes X , Y, Z

A

`80.2`

B

`81.8`

C

`80.5`

D

`81.5`

Text Solution

Verified by Experts

The correct Answer is:
D
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