A and B are brothers. C and D are sisters. A's son is D's brother. How is B related to C?

69) Introducing a man, a woman said, 'His wife is the only daughter of my father'. How is that man related to the woman?

70) A man is facing West. He turns 45 degree in the clock-wise direction and then another 180 degree in the same direction and then 270 degree in the anti-clockwise direction. Which direction is he facing now?

71) A man starts from a point 'X' and walks 3 km southwards, then he turns left and walks 6 km. In which direction is he from the starting point?

72) The H.C.F. of 595 and 252 is