Which of the following interchanges of numbers and mathematical signs would make the given equation correct?
 729 × 81 ÷ 20 + 16 − 6 = 50

If A denotes ‘+’, B denotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 (13 B 9) D 3 A (14 D 7) B 6 C 21 A (32 B 2) = ? 

If A denotes ‘+’, B d enotes ‘×’, C denotes ‘−’ and D denotes ‘÷’, then what will come in place of ‘?’ in the following equation?
 41 C 29 A (38 B 3) D 19 A 61 C 17 = ?

After interchanging which two signs will the value of the given expression be ‘356’?

133 + 49 – 16 ÷ 2 × 34

Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
 14 * 5 *41 * 76 * 35 

After interchanging the two numbers 3 and 6, what will be the value of the given expression?

12 × 3 ÷ 6 + 8 – 2

If I denotes ‘÷’, J denotes ‘×’, K denotes ‘−’ and L denotes ‘+’, then what will come in place of ‘?’ in the following equation?
 37 L 25 K (14 J 2) L (2 J 13) K (62 I 31) = ?

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

If 1 + 4 = 9, 2 + 8 = 18, 3 + 6 = 15 then 7 + 8 =?