IMO, E. Here's why:

[spoiler]A - 20% isn't doubling people... it's doubling the number.
B - not a complete sentence.
C - same as A.
D - wordy, and same as A.
E - bingo... twice the NUMBER.[/spoiler]

Contrapositive Tutorial

<r>Hello,<br/> <br/> Here's a little insight on what the 'contrapositive' is... it's basic logic which can be disguised pretty well by the GMAT. In particular, I've noticed that many people have problems with passages which state something like the following:<br/> <br/> <B><s>[b]</s>Passage:<e>[/b]<...

Process of elimination: B - we're talking about averages, and not pure numbers... this is out of scope (scalability purposes). C - clearly out of scope. D - out of scope. we can conjure cases where the students with the best grades take classroom-based courses. in particular, how many students are t...

I'm going with D . Here's why: [spoiler]A - wrong... what if Novex cures sinus pain much more effectively? B - this is out of scope. C - out of scope: we don't know that Novex is one of these manufacturers. Further, what if Novex is more expensive than other sinus drugs because of cheaper manufactur...

Let X be the final clause, "and at the end of the decade was placed on the fast track to join' A - 'it' refers incorrectly to the economy. B - the clause X incorrectly refers to the economy. C - the clause X incorrectly refers to the economy. D - the clause X incorrectly refers to the economy. ...

I initially picked B for the answer as well. However, I'm still dubious as to why D can't be a correct answer... why can't we treat "allocating funds for victims of war crimes, and signing the Treaty of San Francisco" as a clause modifying "imperial power?"

Difficult Problems Source

Hello, Are there any resources that help with the more difficult verbal problems? I feel that I can take on most of the easy and medium level problems in the verbal section, but sometimes get stumped on the more difficult problems. My current scores are in the low to mid 700s (I haven't officially t...