Three numbers are in the ratio of 5 : 7 : 9 and their

In a certain code language, 'mobile switched off' is written as 'rq mg cr' and 'turn off light' is written as 'my cq. 

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.

Which of the following numbers will replace the question mark (?) in the given series?

15, 27, 12, ?, 9, 33

Which of the following numbers will replace the question mark (?) in the given series?

4, 11, 19, 31, 52, 89, ?

Three of the following four letter-clusters are alike in a certain way and one is different. Pick the odd one out.

DGJM

NQTW

TWZC

HIJK

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

42 ÷ 7 × 5 + 35 – 49 = 18

Select the option figure in which the given figure (X) is embedded as its part (rotation is NOT allowed).

Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?

ZXV, TRP, NLJ, HFD, ?