Question

Three science class A, B and C take a Life Science

test. The average score of class A is 83. The

average score of class B is 76. The average score

of class C is 85. The average score of class A and

B is 79 and average score of class B and C is 81.

Then the average score of classes A, B and C is ?​

Answer 1

Answer:

83+76+85/3

=81.33333333333333333333