I took several minutes to solve this problem and all I could come up with an answer E. A question like this can really kill me on the real GMAT
E is correct.
I totally understand..but i guess the only way is to write down the correct way that you used to get to the answer here....
If i take more than 1.5 minutes to crack a problem, the problem goes into my binder. Just reading your notes before exam day can calm your nerves a lot. you can practice , but important thing is whether you improve by working that hard..isnt it?
That only reason i post these questions is to undertand how the other guys do it...and more often than not, i pick up great tips from the other members..