The average of a and b is 10, average of b and c is 12 and average of c and a is 15. What is the average of a, b and c?
Answer & explanation
Correct answer: option 1
Sum of a & b = 2 × 10 = 20
Sum of b & c = 2 × 12 = 24
Sum of c & a = 2 × 15 = 30
2 ( a + b + c ) = 74
a + b + c = \(\frac{74}{2}\) = 37
Average of ( a + b + c ) = \(\frac{37}{3}\)