The bullet-proof way would be to plug in some real numbers as maryadkins did.
But, as maryadkins said:
maryadkins Wrote:If you don't want to get into the math, think about it this way.
They ended up approving the same number of books. The first censor knocked out a greater percentage than the second. That means the first must have had more books to deal with in the first place.
I got to answer (C) by process of elimination.
So when I first read the argument, my hunch told me it would have something to do with the percentages (the 1/2 and the 1/4). So something to do with numbers/proportions/percentages. Alright let's read on.
(A): We don't know anything about books critical of the government. The argument only talks about legally published books, which are not critical of the government
(B): This one deals with numbers. Let's keep it for now.
(C): This one also deals with numbers, let's keep it as well.
(D): We have no way of knowing this. We don't know what criteria the first censor used, and we don't know what criteria the second censor used. And we def don't know how they compare against each other.
(E): Number of writers? Argument talks about number of books. Eliminate
So we're down to B and C.
(B) is wrong because if the first censor and the second censor prohibited the same amount of books, and, as the argument states, also published the same amount of books, how is it possible that the first censor prohibited 50% while the second censor prohibits 25%? The math doesn't add up.
That leaves us with (C). I could explain why (C) is correct, but maryadkins pretty much killed it, so refer to her post for more detail.
In response to the question regarding using a quantitative method, I would say, in my humble-totally-not-expert opinion, to just use whatever is best/quickest for you. If you're doing a timed PT, just do with what feels best/natural. If you're reviewing, try several methods, and see which one suits you best.
Personally, I tried plugging in the numbers in my head and then I got lost (which in retrospect, is weird because now that I think about it, the math really wasn't that hard) so I just went ahead and did what I just illustrated above.