If '+' means addition, '-' means subtraction, '×' means power, and '÷' means square root, then what is the value of the following expression? 3 × 4 - 16 ÷ 2 + 25 = ?

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? 13 B 2 C 6 D 8 A 4 = ?

Which two signs should be interchanged to make the given equation correct? 30 + 35 × 7 - 3 ÷ 10 = 5