By interchanging the given two signs which of the following equation will be not correct?
 – and × 

If ‘A’ denotes ‘+’, ‘B’ denotes ‘×’, ‘C’ denotes ‘–’ and ‘D’ denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 71 A 3 B 2 C 6 B (65 D 13) C 7 B4 =?

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and ×, 1 and 2

If ‘+’ means ‘÷’, ‘ ̶ ’ means ‘+’, ‘×’ means ‘ ̶ ’ and ‘÷’ means ‘×’, what will be the value of the following expression?
 [{(32 × 20) - (2 ÷ 3)} + (2 - 4)] ÷ 3

Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.
 57 * 35 * 44 * 11 * 13 *74

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
 25 * 4 * 6 * 2 * 17

Direction: Some equations have been solved on the basis of certain system. Find the correct answer for the unsolved equation on that basis.

6 × 2 × 9 = 269

8 × 7 × 1 = 781

4 × 1 × 3 = ?

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 2 and 4