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2,6,6,12,12,12,18,12 wrong one

I m preparing for SSC and banking both is it not good I got many negative revies that's why I m asking @maruti

Average of x observation is 30, average of x other
observations is 33 and average of remaining x observations is 42. Average of all the observations is
A. 34 B. 35 C. 36 D. Cannot be deter-
mined E. None of these

Please give me a detailed solution as I am getting 35 as answer but the right answer is D according to the answer key.

upcoming Banking Exams in 2017?

PLz explain logic behind it

where can I find sectionals in cracku app..!

how to solve spotting errors

plz provide me : link for download niacl assistant's previous year papers

Please suggest me a time management skills to crack the cutoff..??

x²+x-6=0 ; y²-y-12=0... what will be the answer .. (y>=x or ;x=y no relation) please explain me.