Given interchanges : 

Signs + and - , numbers 4 and 8.

$$\begin{gathered} If (─) stands for division, (+) stands for multiplication, (÷) stands for subtraction and \\ (×) stands for addition, which one of the following equations is correct? \end{gathered}$$

If 17 + 17 = 2895 18 + 18 = 3245 19 + 19 = 3615 then 23 + 23 = ?

In the following problem, '=' stands for '÷' , '+' stands for '­' , 'x' stands for '=', '­' stands for '+' and '÷' stands for 'x'. Find the correct equation.

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

15 x 26 = 6512

29 x 36 = 6923,

46 x 54 = ?

If 3 # 4 % 8 = 6 and 9 % 4 # 3 = 12, then 12 % 6 # 24 = ?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then 81 x 9 + 10 – 6 ÷ 5 = ?

In the following question, select the number which can be placed at the sign of ? from the given alternatives.

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.19 ÷ 2 - 35 + 10 x 6 = ?