The cause of viscosity of human blood

Select the correct combination of mathematical signs to sequentially replace the signs, to balance the following equation.

(12*7*6)* 13 *6

If ‘#’ denotes ‘-‘, @ denotes ‘×’, ‘$’ denotes ‘+’ and ‘%’ denotes ‘÷’, then 

20 $ 15 # 10 @ 45 % 15

Which signs should be interchanged to make the given equation correct.

45 × 5 + 60 ÷ 12 - 25 = 165

Which of the following is correct?

After interchanging ÷ and × , 4 and 8, which of the following equations becomes correct?

Which signs should be interchanged to make the given equation correct.

45 ÷ 5/3 + 10 × 2/5 - 5 = 95

If 'P' denote '÷', 'θ' denotes 'x', 'R' denotes '+' and 'S' denotes '-', what is the value of ' 18 θ 12 P 4 R 5 S 6 '.

Which two signs should be interchanged to make the given equation correct?

225 + 5 × 3 ÷ 5 – 7 = 133

The given equation has been solved on the basis of a certain rule. Find the correct answer for the unsolved equation on that basis.