Directions: Read the following information carefully and answer the questions given below it.
(i) ′A−B′ means 'A is the sister of B'.
(ii) ′A×B′ means 'A is the husband of B'.
(iii) ′A÷B′ means 'B is the brother of A'.
(iv) ′A+B′ means 'B is the mother of A'.
If ′P+Q−R÷S×T′, then R is T's