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? 75 B 4 D 20 A 40 C 8 = ?

What will come in place of the question mark (?) in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged? 37 ÷ 5 - 91 + 16 × 4 = ?

If '+' and '-' are interchanged, and '×' and '÷' are interchanged, then what will come in place of the question mark (?) in the following equation? 26 ÷ 676 × 156 - 69 + 83 = ?