The average of a and b is 40 and the sum of b and c is 70. what is the value of a -c?

The average of a and b is 40 and the sum of b and c is 70. what is the value of a -c? Correct Answer 10

                                a+b = 40*2 = 80                                             b+c = 70(doing subtraction),    a-c = 10 (Ans)
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