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--- Well spotted. The 'n' in the Arithmetic Progression equation should be replaced with (n-1)/2. Because when you have every other number in a continous series, the total no of even numbers is (n-1)/2 when the nth term is odd.

Is this where we can discuss the solutions to the problems? I'm looking at problem two and don't quite understand a couple of things.

1) Do we have to add the two equations: x+y+z=50 & 6x-2y-z=192 or can we subtract them? Why or why not? 2) Where does the assumption that y can't be 1 or 2 come from. Please explain.

Thanks in advance

Liz _________________

The Brain Dump - From Low GPA to Top MBA(Updated September 1, 2013) - A Few of My Favorite Things--> http://cheetarah1980.blogspot.com

Re: 50 tricky questions [#permalink]
02 Aug 2011, 13:03

How are you supposed to actually learn how to solve these questions? I could spend an hour trying to solve some of the questions and even that I will probably still be stumped....is there a good way to learn the tricks to solve these toughies?

gmatclubot

Re: 50 tricky questions
[#permalink]
02 Aug 2011, 13:03

Low GPA MBA Acceptance Rate Analysis Many applicants worry about applying to business school if they have a low GPA. I analyzed the low GPA MBA acceptance rate at...

In out-of-the-way places of the heart, Where your thoughts never think to wander, This beginning has been quietly forming, Waiting until you were ready to emerge. For a long...