What is the optimal temperature range for the

If '32 @ 5 = 7' and '46 @ 12 = 12', then '34 @ 18 = ?'. What will come in place of question mark?

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.\

If 24 @ 15 = 46 and 56 @ 24 = 108, then 45 @ 32 = '?'.

In each of the following questions, select the related word from the given alternatives:

COVER : EMXCT :: MOUSE : ?

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

PARENTS : RUMFQBO :: FORESTS : ?

Select the option in which the words share the same relationship as the pair below.

Brave : Courageous

If I = 18, ICE = 34, then ‘RICE’ will be equal to? 

Select the option in which the numbers are not related in the same way as the numbers in the following set.

(53, 16, 21)