Statement (1) can be simplified and looked at conceptually. No need to pick numbers. (x + z)/2 = y Since we have no idea what y is, statement (1) is insufficient. Statement (2) tempts us to use the difference of squares common equation. (x + y)(x – y) = z Since x, y and z are all positive, we know...

This problem contains an error. As written, the problem does not specify that the distance from P to Q is c meters. Intuitively, the total distance from P to Q should matter, and in fact it does. The wording of the problem could be fixed by changing the first sentence to: "Swimming at a constan...

The PowerScore Sentence Correction Bible does have problem sets at the end of most chapters. Check it out on Amazon.com - you can use the LOOK INSIDE! feature to preview the book.

Hope this helps. Good luck!

You might want to check out the Sentence Correction books from Veritas, Manhattan GMAT, and PowerScore. These are all available at Amazon.com.

Good luck!

Yes, "as" has several different uses. It can introduce a phrase or a clause. For example: Clause As I walked to school , I enjoyed the crisp morning air. "I walked to school" is a clause because it contains a subject ("I") and a verb ("walked"). Phrase As gove...

Since a is the probability of getting at least one king, there are three scenarios that provide the desired outcome: KO, OK, and KK, where K=king, O=other card. You're missing the OK scenario, which adds (4/6)*(2/5) to a. The order matters when you look at all the possible outcomes in this way, so y...

A table is not necessarily the most efficient way to evaluate this problem. In my opinion, a table offers the most universally helpful approach to these 2-set overlapping set problems because a table lays out all the information in way that makes it easy not to miss anything. But as in this case, th...