What will come in place of the question mark (?) in the following equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged? 45 ÷ 13 - 286 × 2 + 68 = ?

If 'A' stands for '÷', 'B' stands for '×', 'C' stands for '+' and 'D' stands for '-', then what will come in place of the question mark (?) in the following equation? 37 C 32 A 2 D 9 B 2 = ?

If 'A' means '÷', 'B' means '×', 'C' means '+' and 'D' means '-', then what will come in place of the question mark (?) in the following equation? 5 B 2 D 12 A 6 C 2 = ?