Mister Black , Brown and Green are eating at a restaurant.
Each is wearing a coloured tie.
The ties are black, brown and green in colour.

Suddenly the man wearing the green tie says : 
" Did you notice that our ties are the same colour as our names but no one is wearing a tie similar to his name ?

"Strange, indeed",  says Mr Black.

Question :  What colour tie was each man wearing ?

See answer