Average age of A and B is 20 years. Average age of B and C is 18 years. Average age of A and C is 21 years. What is the average age (in years) of A, B and C?
1
7.1
2
19.67
3
19
4
29.5
Average age of A and B is 20 years. Average age of B and C is 18 years. Average age of A and C is 21 years. What is the average age (in years) of A, B and C?