Select the letter-pair that can replace the question mark (?) in the following series.

AR, CU, EX, GA, ?

Select the number that can replace the question mark (?) in the following series.

31, 44, 58, 73, 89, ?

If the two signs, '+ and ÷ ' are interchanged, which of the following equations will be correct?

Six laptops, N, Q, P, L, R and A, are placed in a row facing towards the north (not necessarily in the same order). N is placed to the immediate left of A. R is placed second to the left of Q. P is placed second to the right of A. P is placed to the immediate right of R. L is placed to the left of N. Which laptop is placed to the immediate right of L?

Select the number that can replace the question mark (?) in the following series.   

16, 20, 29, 45, 70, ?

In a certain code language, ‘PING’ is written as ‘4’ and ‘METAL’ is written as ‘5’. What will be the code for ‘STEADYS’ in that code language?

Select the option that is related to the third number in the same way as the second number is related to the first number.

35 : 64 :: 29 : ?

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

73 – 13 × 42 ÷ 14 + 56 = 56