Persons X, Y, Z and Q live in Red, Green, Yellow or Blue coloured houses which are in sequence on a street. Z lives in a Yellow house. The Green house is adjacent to the Blue house. X does not live adjacent to Z. The Yellow house is in between the Green and Red house.

The colour of house, X lives in is:

Blue

According to given condition the correct sequence of houses is 1st is blue, 2nd green, 3rd is yellow and last red.

Now in the yellow house i.e. 3rd Z lives and X does not live as a neighbour i.e. Green and Red house.

Thus, X lives in blue house.