Is z even?

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by vinay1983 » Fri Aug 23, 2013 6:04 am
GMATGuruNY wrote:I posted a solution here:

https://www.beatthegmat.com/unable-to-so ... 68331.html
but my query is by combining both statements how/why should we arrive at 2z?Is it becuase we know that even-even=even? or is there anything else to it?