TCS Company Numerical Ability Number System

If there are 30 numbers and the average of the first 10 numbers is equal to the average of last 20 number what is the sum of last 20 numbers
a) same as the sum of first 10 numbers
b) 2 times the sum of first 10 numbers
c) average of first 10 numbers
d) none of the above

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TCS Other Question

I was asked to write a leter of gratitude to my former professor mr Matt.You should be addressed as Peter
The key words were
successful-placed-gratitude-advice-help-grooming-values-shaping my future-sincere-professional
Letters of alphabets no from 1 to 26 are consecutively with 1 assigned to A and 26 to Z. By 27th letter we mean A, 28th B. In general 26m+n, m and n negative intezers is same as the letters numbered n.
Let P = 6, strange country military general sends this secret message according ot the following codification scheme. In codifying a sentence, the 1st time a letter occurs it is replaced by the pth letter from it. 2nd time if occurred it is replaced by P^2 letter from it. 3rd time it occurred it is replaced by p^3 letter from it. What is the code word for ABBATIAL
a) GHNNZOOR
b) GHKJZOHR
c) GHHGZOGR
d) GHLKZOIR