REALLY need explanation!

What is the value fo x^2 + y^2? 1) x^2 + y^2 = 2xy + 1 2) x^2 + y^2 = 4 - 2xy Here's the answer OA is E Here's my logic. [spoiler]I think it's C. It's clear that stem 1 is equal to (x-y)^2 = 1, and stem 2 is (x+y)^2 = 4. Each on its own is insufficient. But if you can solve for 2xy, then you know th...

Four dollar amounts, w, x, y, and z

Four dollar amounts, w, x, y, and z, were invested in a business. Which amount was greatest?

1. y < z < x
2. x was 25 percent of the total of the four investments.

OA to follow shortly.

[spoiler]Official Answer: E[/spoiler] Official explanation: This is an explanation/paradox question. From a quick reading, the two reports seem to claim that 80% of electronics were manufactured in China, and 38% of products were made in other places. Clearly that's incorrect--there must be more to ...

Manufactured in China

From an article in the Wall Street Chronicle: Sales statistics of major electronics manufacturers with sales in the United States show that 80% of consumer electronics (such as televisions, DVD players, and computers) sold in the U.S. last year were manufactured in China. From an article in Consumer...

http://www.beatthegmat.com/equatons-are ... 16917.html

Please illustrate your logic behind the answer. Thanks. 1) x = y + 1/2 OKAY WE KNOW WHO IS THE DADDY! X>Y 2) X/Y > 1 HERE IS THE TRAP! (Y+1/2) / Y > 1 OR 1 + Y/2 > 1 hmmm...so, Y/2>0 ---> Y>0 (small mistake here: 1+1/2y > 1, or 1/2y>0, or y>0) Remember X > Y So these guys are both POSITIVE Thing to...

GmatVerbal, I love how you can solve this in 3 lines where others take half a page. But your concise solution fails to explains your rationale. You may understand it, but I sure don't. So, if your intent is for others to wonder in amazement about how it is that you can solve difficult problems in 3 ...