Which two signs should be interchanged to make the given equation correct?
28-28÷14+7×2=16

If '+' stands for multiplication, '<' stands for division, ' ÷' stands for subtraction, '-' stands for addition and '×' stands for greater than, which expression is correct

If 'A' means '÷', 'B' means 'x', 'C' means '+' and 'D' means '−', then what will come in place of the question mark (?) in the following equation?
(80 A 8) B 5 C 14 B 2 D 11 B 3 C 72 A4 = ?

If ‘A’ stands for ‘÷’ , ‘B’ stands for ‘x’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘-‘ , what will be come in place of question mark ‘?’ in the following equation?
16 B 4 D 56 A 2 C 7 = ?

If ‘A’ stands for ‘÷’ , ‘B’ stands for ‘x’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘-‘ , what will be come in place of question mark ‘?’ in the following equation?
19 B 3 D 18 A 6 C 5 = ?

What will come in place of the question mark (?) in the following equation if ‘+’ and ‘−‘ are interchanged and ‘×’ and ‘÷’ are interchanged?
14 ÷ 3 − 15 × 5 + 5 = ?

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘− ’ are interchanged and ‘×’ and ‘÷’ are interchanged?
8 ÷ 5 + 20 × 4 - 9 = ? 

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
37 ÷ 5 − 91 + 16 × 4 = ?

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
66 × 6 ÷ 3 − 128 ÷ 2 + 15 × 3 − 16 ÷ 2 + 17 = ?