Pointing to a man, a woman said, 'His mother is the only daughter of my mother.' How is the woman related to the man? MCQ with Answer and Explanation

Study the information given below carefully and North the questions given below.
I. P+Q means Q is the only sister of P.
II. P Q means Q is the mother of P.
III. PxQ means Q is the brother of P.
IV. P* Q means Q is the father of P.
V. P Q means Q is the wife of P.
VI. P%Q means Q is the son of P.
Which of the following expressions shows that the brother of L is the grandfather of Z?

A + B means 'A is the mother of B.'
A - B means 'A is the father of B.'
A × B means 'A is the sister of B.'
A + B means 'A is the daughter of B.'
If P + R × T - Q ÷ S + U, then how is S related to T?

A + B means 'A is the father of B';
A-B means 'A is the sister of B';
A × B means 'A is the brother of B';
A + B means 'A is the mother of B';
If, U+ HL-Q+R-Y, then how is L related to Y?