If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?
 45 × 9 ÷ 12 – 5 + 3

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

3 × 5 × 7 × 2 = 24, 2 × 4 × 6 × 8 = 22, 4 × 4 × 8 × 9 =?

Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
 41 * 4 * 39 * 73 * 25 * 4 * 30

By Interchanging the given two numbers which of the following equation will be not correct?
 3 and 4

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 = 14; 5 × 4 = 18; 6 × 5 = 22, then find the value of 7 × 6.

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

If 10 – 3 = 12, 12 – 4 = 13, 14 – 5 = 14, then 16 – 6 = ?

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
 25 * 5 * 10 * 2 * 13

After interchanging the given two numbers and two signs what will be the values of equation (I) and (II) respectively?
 + and ×, 5 and 4
 I. 4 + 6 × 5 – 7 ÷ 1
 II. 5 × 3 – 4 + 8 ÷ 2