If 'A' stands for '×', 'B' stands for '÷', 'C' stands for '-' and 'D' stands for '+', then what will come in place of question mark (?) in the following equation? 27 B 3 D 5 A 10 C 12 D 15 C 27 = ?

If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark (?) in the following equation? 159 C 60 A 12 B 11 D 203 = ?

What will come in place of '?' in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged? 33 + 31 × 31 ÷ 2 - 49 = ?