
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
September 14th, 2012, 09:12 PM  #1 
Newbie Joined: May 2012 Posts: 23 Thanks: 0  numeric entry problem with answer..but I think the answer is
wrong. Here is the question: Assume that 2x is a positive multiple of 5 and is greater than 5. If 2x + 1 < 100, how many values for x are possible? I said the answer would be 18, but the website I found the question and answer on says the answer is 17 http://www.west.net/~stewart/gre/practi ... ntry4.htm The reasoning is that x must be greater than 5, but the problem says that 2x is greater than 5 NOT x. Can someone shed some light? Thanks! 
September 14th, 2012, 09:44 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,205 Thanks: 512 Math Focus: Calculus/ODEs  Re: numeric entry problem with answer..but I think the answe
I agree with you, you would not eliminate 5, since 5<2·5.

September 14th, 2012, 10:27 PM  #3 
Global Moderator Joined: Dec 2006 Posts: 19,870 Thanks: 1833 
As 5 < 2x < 99, 2x ? {10, 15, 20, 25, 30, 25, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95}. Hence 18 is correct.


Tags 
answer, answerbut, entry, numeric, problem 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
What makes a limit problem have an answer of infinity/zero?  warnexus  Calculus  1  March 18th, 2013 01:37 PM 
What's the answer to this word problem??!!  bulloto  Elementary Math  2  April 5th, 2012 08:49 PM 
Can you check my answer for me on this problem?  shin777  Algebra  1  December 10th, 2011 02:15 AM 
word problem answer check.. thanks  ElMarsh  Algebra  9  July 31st, 2009 07:06 AM 
FUN MATH i give you the answer, you come up with the problem  todd  Real Analysis  5  March 14th, 2008 06:28 AM 