Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: a is two years older than b who is twice as old as c . if the total of the ages of a , b and c be 27 , the how old is b
10
b = 6.