IMO - A

statement 1 says that Y has all the same factor as 27 i.e. only factors of Y are (3*3*3) . Hence no 2 available .
Therefore NO

Hence A

Gmatprep2- 34

Please advise how to reach to correct answer?

Gmatprep2- 11

http://s2.postimage.org/Fmr39.jpg Please suggest how to work with a, b & c options. Use of word 'than' needs parallel construction before and after the word. So, if a clause is before the word 'than' , clause will be after the word. I am not sure above its preference over the tense parallelism ...

Gmatprep2- 4

Experts please explain how to kick the incorrect options ?

So , the Answer is E.

One more query. If it is mentioned that x, y & z are intergers , answer would be C.

list1 a = 3, {11, 12, 19}
list2 a = 4 {10, 14, 18}
list3 a =5 {9, 16, 17}

list1 & list3 will be go by statement.

P^2 + P^2 = even
M+N = odd

Hence C

Best of Luck...

D

By solving 1 Tom timing is 6 and that of Jack is 12. however, not able to solve with second and getting calculation error

1/T + 1/J = 1/4 (1)
1/2T + 1/J = 1/3 (2)

Solving 1 & 2
1/T - 1/2T = 1/4 -1/3 = -ive (not possible ) . Please suggest.