The simplification of 106 - [56 + {42 ÷ 7 × 9 - 11}] gives the result:

What will come in place of the question mark (?) in the given equation, if '+' and '-' are interchanged and '×' and '÷' are interchanged? 15 + 22 × 11 - 8 ÷ 3 = ?

If 'P' stands for '-', 'Q' stands for '×', 'C' stands for '÷' and 'D' stands for '+', what will come in place of the question mark (?) in the following equation? 8 D 5 C 1 Q 12 P 21 = ?