Read the following information carefully and answer the questions which follow.
(i) ′A×B′ means 'A is the wife of B'.
(ii) ′A+B′ means 'A is the brother of B'.
(iii) ′A÷B′ means 'A is the daughter of B'.
(iv) ′A−B′ means 'A is the son of B'.
How is R related to Q, if ′P−Q+R÷T′?