Select the correct combination of mathematical signs to replace the * signs and balance the given equation.
66 * 6 * 12 * 3 * 15 = 12

By Interchanging the given two numbers which of the following equation will be not correct?
5 and 9

In a certain language, if the signs + and ×, and the digits 3 and 8 are interchanged, then what is the value of the following expression?
 6 × 35 ÷ 5 + 8 – 9

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

If 4 + 3 = 25 and 8 + 4 = 80, then, 3 + 2 = ?

Select the correct combination of mathematical signs to replace the * signs and balance the given equation.
 21 * 4 * 156 * 13 * 11 = 83

Which of the following interchange of numbers and mathematical signs would make the given equation correct?
72 ÷ 8 × 9 − 36 + 20 = 80

Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
 34 * 4 * 15 * 51 * 27 * 9 * 40

If I denotes ‘÷’, J denotes ‘×’, K denotes ‘−’ and L denotes ‘+’, then what will come in place of ‘?’ in the following equation?
 42 L 18 K (7 J 4) L (21 I 3) J 9 L 22 = ?