Search found 6 matches
Valleeny,
If x < 10 and y <5, then x+y < 15. Take a look at the other post I made with a question to Stuart Kovinsky -> even the addition rule, while a decent rule of thumb, is not foolproof.
- by beat2009
Fri Jan 22, 2010 11:12 am- Forum: Data Sufficiency
- Topic: Perplexing Inequality Issue: Is x less than 20?
- Replies: 9
- Views: 2343
Exceptional stuff, all. Thanks Osirus. Stuart, you did not disappoint--terrific insight and a lesson I won't soon forget. Funny how it's the questions you get wrong that yield the lessons with the most stickiness.
- by beat2009
Fri Jan 22, 2010 11:08 am- Forum: Data Sufficiency
- Topic: Inequality Question for Stuart Kovinsky
- Replies: 5
- Views: 2268
Inequality Question for Stuart Kovinsky
Stuart, having noticed the superb quality of your insights on other posts, I'm crossing my fingers and hoping that you might tack a crack at the following question from one of my official GMAT CATs (the software from the testmakers). I think it highlights a fundamental question about inequalities th...
- by beat2009
Thu Jan 21, 2010 11:16 am- Forum: Data Sufficiency
- Topic: Inequality Question for Stuart Kovinsky
- Replies: 5
- Views: 2268
Thanks. I've used the algebraic approach with success in numerous other problems. And per some of the GMAT prep books, as long as you have the inequality symbol pointed in the same direction, you may add the inequalities. Instructors, anyone else: does ANYONE have a definitive answer on this? Again,...
- by beat2009
Thu Jan 21, 2010 10:48 am- Forum: Data Sufficiency
- Topic: Perplexing Inequality Issue: Is x less than 20?
- Replies: 9
- Views: 2343
Per my original post, I see how you can crack this by substituting numbers. That's not the question. I'm trying to figure out why a straightforward algebraic approach doesn't work. I had processed it using basic algebra and it came up with the right answer. Any ideas out there? Thanks much.
- by beat2009
Mon Jan 18, 2010 2:43 pm- Forum: Data Sufficiency
- Topic: Perplexing Inequality Issue: Is x less than 20?
- Replies: 9
- Views: 2343
Perplexing Inequality Issue: Is x less than 20?
Question: Is x less than 20? (St 1): The sum of x and y is less than 20. (St 2): y is less than 20. OA is E. My problem is NOT seeing why E is correct. The thing that has me baffled is why a straightforward algebraic approach doesn't work (see my next paragraph). Eliminating 1 & eliminating 2 is...
- by beat2009
Fri Jan 15, 2010 4:33 pm- Forum: Data Sufficiency
- Topic: Perplexing Inequality Issue: Is x less than 20?
- Replies: 9
- Views: 2343