The average of two numbers A and B is 20, that of B and C is 19 and of C and A it is 21. What is the value of A?
average of two numbers A and B is 20
sum of two numbers A and B = $$ 20 \times 2 = 40 $$
average of two numbers B and C is 19
sum of two numbers B and C = $$ 19 \times 2 = 38 $$
average of two numbers C and A is 21
sum of two numbers C and A = $$ 21 \times 2 = 42 $$
2(A + B + C) = 120
A + B + C = 60
A = 60 - 38 = 22
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