If '+' represents addition, '-' represents subtraction, '×' represents multiplication, and '÷' represents division, what is the value of 8 ÷ 2 + 3 × 4 - 5?
In a family of five members - P, Q, R, S, and T - there are two males and three females. P is a teacher, Q is a doctor, R is the son of P, S is the daughter of Q, and T is the wife of P. Who is the doctor?