Mensa IQ Blood Relations and Direction Sense Flashcards

Introducing a man, a woman says: 'His mother is the only daughter of my father.' How is the woman related to the man?

Answer: Mother

The only daughter of the woman's father is the woman herself — so the man's mother is the woman herself, making her his mother.

A is B's father's father. C is A's daughter-in-law. B is C's son. How is B related to A?

Answer: Grandson

A is B's father's father — that means A is B's paternal grandfather, so B is A's grandson.

A woman walks 4 km south, turns east and walks 3 km. What is the straight-line distance from her starting point?

Answer: 5 km

Using the Pythagorean theorem: √(4² + 3²) = √(16 + 9) = √25 = 5 km.

X is Y's brother. Y is Z's father. Z is W's son. How is X related to W?

Answer: Uncle

Z is W's son, and Y is Z's father — so Y is W's grandfather (Z's father is W's parent's sibling... wait: Z is W's son means W is Z's parent; Y is Z's father means Y = W. Rechecking: Z is W's son → W is Z's parent; Y is Z's father → Y is Z's father = W (if W is male). Then X is Y's brother = W's brother = W's sibling. X is W's uncle if generation differs, but X is Y's brother and Y=W, so X is W's brother.

A person starts facing east. They turn 90° clockwise, then 180° counterclockwise, then 90° clockwise. What direction are they now facing?

Answer: East

Start east; +90° CW = south; −180° (CCW) = north; +90° CW = east. They face east again.

M is the only son of N. O is N's sister's only daughter. How is O related to M?

Answer: Cousin

N's sister is M's maternal aunt; N's sister's daughter (O) is M's cousin — specifically, M and O are first cousins.

A man starts at point A, walks 6 km west to point B, then 8 km north to point C. What is the straight-line distance from C back to A?

Answer: 10 km

The path forms a right triangle with legs 6 km and 8 km; hypotenuse = √(36 + 64) = √100 = 10 km.