Which of the following symbols should be placed in the blank spaces respectively (in the same order from left to right) in order to complete the given expression in such a manner that “D < A” definitely holds True?
A __ B __ C __ D

By interchanging the given two signs and numbers which of the following equation will be correct?
 + and –, 2 and 4

Select the correct combination of mathematical signs to replace the * signs and to balance the given equation.
 37 * 3 * 21 * 79 * 18 * 4 * 19

By interchanging the given two signs which of the following equation will be not correct?
 + and –

Select the correct combination of mathematical signs to sequentially replace the # signs and to balance the given equation.
 [{(44 # 38) # (2 # 5)} # (4 # 2)] # 5 # 10

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

6 × 2 × 9 = 269

8 × 7 × 1 = 781

4 × 1 × 3 = ?

What will be the value of the given expression if ‘A’ means ‘+’, ‘B’ means ‘–’, ‘C’ means ‘×’, and ‘D’ means ‘÷’?
 35 A 25 B 12 C 25 D 5 

Which two signs need to be interchanged to make the following equation correct?

9 + 3 − 4 ÷ 5 × 2 = 9