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Want to improve your CR: http://gmatclub.com/forum/cr-methods-an-approach-to-find-the-best-answers-93146.html Tricky Quant problems: http://gmatclub.com/forum/50-tricky-questions-92834.html Important Grammer Fundamentals: http://gmatclub.com/forum/key-fundamentals-of-grammer-our-crucial-learnings-on-sc-93659.html

--- 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

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?

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