If 4 # 2 = 10, 5 # 3 = 18, and 6 # 4 = 28, then what is the value of 7 # 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

If 'A' means '÷', 'B' means '×', 'C' means '+' and 'D' means '-', then which of the following expressions will yield a result of 156?

If 'A' means '×', 'B' means '÷', 'C' means '-' and 'D' means '+', then which of the following expressions equals 149?

If 'A' denotes '÷', 'B' denotes '×', 'C' denotes '+', and 'D' denotes '−', then what will come in place of the question mark '?' in the following equation? 20 B 2 D 25 A 5 C 15 = ? D 5

If 'E' means '+', 'F' means '-', 'G' means '÷', and 'H' means '×', then what will come in place of the question mark (?) in the following equation? 55 G 11 E 11 H 1 F 9 = ?

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? 22 B 2 D 8 A 2 C 12 = ?

What will come in place of '?' in the following equation if '+' and '-' are interchanged and '×' and '÷' are interchanged? 849 + 131 - 861 × 287 ÷ 836 × 209 + 74 = ?