‘A + B means "A is the son of B, A – B means A is

If 32 @ 10 = 32 and 42 @ 30 = 76, then 28 @ 56 = '?'.

If HOT = 81520 and HEAT = 85120, then HEATER =

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

PAIR : KZRI :: MINT : ?

If 66 @ 26 = 15' and 44 @ 6 = 12', then 56 @ 12 = ?'. What will come in place of question mark? 

Select the set of numbers that is similar to the following set:

(23, 7, 24)

Select the set in which the numbers are related in the same way as the numbers of the given set.

14 : 75 : : ?

Select the related letters/word/number/figure from the given alternatives.

30 : 68: : ? : 10