Question

The average age of A and B is 20 years, that of b and C is 19 years and that of A and C is 21 year
What is the age (in years) of B?
(a) 39
(b) 21
(d) 18​

Answer 1

I think answer is 21

Answer 2

Answer:

Answer is 20.

Step-by-step explanation:

A+B/2= 20

A+B= 40______1

B+C/2=19

B+C = 38______2

A+C/2=21

A+C=42_______3

= (A+B+B+C+A+C)

=( 40   + 38  + 42)

2(A + B + C) = 120

A + B + C = 120/2

A + B + C = 60

Finally the average will be,

= 60 / 3

=20 Answer.