If 'A' means 'multiplied by', 'B' means 'divided by', 'C' means 'minus', and 'D' means 'plus', then what will be the value of the following expression? 6 A 6 C 20 B 2 D 5 = ?

If '+' is interchanged with '-' and '×' is interchanged with '÷', what will come in place of '?' in the following equation? 529 ÷ 23 + 89 - 12 × 9 = ?

By interchanging which two signs will the given equation become correct? 15 - 9 ÷ 6 × 10 + 5 = 25