Portal Forums Links Register FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read Log in

 Thread Tools Search this Thread Display Modes
Math logic puzzler for fun
 07-21-2017, 06:50 AM #1 Give me a museum and I'll fill it. (Picasso)Give me a forum ...   Join Date: Jun 2007 Posts: 7,951 Math logic puzzler for fun Solve this: 1 + 4 = 5 2 + 5 = 12 3 + 6 = 21 5 + 8 = ? What is the last answer? I'll post the answer sometime this evening (eastern time), to give people a chance to answer. __________________
 Join the #1 Early Retirement and Financial Independence Forum Today - It's Totally Free! Are you planning to be financially independent as early as possible so you can live life on your own terms? Discuss successful investing strategies, asset allocation models, tax strategies and other related topics in our online forum community. Our members range from young folks just starting their journey to financial independence, military retirees and even multimillionaires. No matter where you fit in you'll find that Early-Retirement.org is a great community to join. Best of all it's totally FREE! You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with our members, see fewer ads, upload photographs, create a retirement blog, send private messages and so much, much more! Join Early-Retirment.org For Free - Click Here
 07-21-2017, 06:54 AM #2 Recycles dryer sheets   Join Date: Feb 2010 Posts: 374 45 __________________
 07-21-2017, 06:55 AM #3 Recycles dryer sheets   Join Date: Nov 2010 Location: Earth Posts: 334 34
 07-21-2017, 07:05 AM #4 Thinks s/he gets paid by the post   Join Date: Jul 2007 Posts: 2,042 Looks like a trick question, I'll go with 13.
 07-21-2017, 07:07 AM #5 Recycles dryer sheets   Join Date: Sep 2005 Posts: 58 45 __________________ "The surest sign that there is intelligent life out there is that they haven't tried to contact us yet." Calvin & Hobbes
 07-21-2017, 07:10 AM #6 Recycles dryer sheets   Join Date: Jan 2017 Posts: 74 45
 07-21-2017, 07:11 AM #7 Recycles dryer sheets   Join Date: Aug 2013 Posts: 275 34
 07-21-2017, 07:11 AM #8 Full time employment: Posting here.   Join Date: May 2013 Posts: 750 45 __________________ “Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.” ― Kenneth Grahame, The Wind in the Willows
 07-21-2017, 07:15 AM #9 Thinks s/he gets paid by the post   Join Date: Oct 2014 Posts: 1,043 34 I should move this to the "pet peeves" post. Puzzles like this are nice little brain teasers, but the syntax is totally nonsensical and are like nails on a chalkboard to me. The + and = symbols have very specific meaning. One should not just throw around terms such as " 2+5=12". It is bad math grammar.
 07-21-2017, 07:16 AM #10 Thinks s/he gets paid by the post   Join Date: Oct 2008 Posts: 1,638 Probably more than one answer. The one that stands out to me is 34.
 07-21-2017, 07:17 AM #11 Give me a museum and I'll fill it. (Picasso)Give me a forum ...   Join Date: Nov 2009 Posts: 5,015 I like 45, too. __________________ Retired in late 2008 at age 45. Cashed in company stock, bought a lot of shares in a big bond fund and am living nicely off its dividends. IRA, SS, and a pension await me at age 60 and later. No kids, no debts. "I want my money working for me instead of me working for my money!"
 07-21-2017, 07:21 AM #12 Recycles dryer sheets   Join Date: Jan 2017 Location: Charlotte Posts: 221 45 “a + b” then answer is “a + (a x b)” in each case.
 07-21-2017, 07:24 AM #13 Thinks s/he gets paid by the post   Join Date: Sep 2009 Location: Hong Kong Posts: 1,677 Any of 13, 34 and 45 can be supported with logic which I suppose is the whole point of the exercise. __________________ Budgeting is a skill practised by people who are bad at politics.
07-21-2017, 07:28 AM   #14
Recycles dryer sheets

Join Date: Aug 2013
Posts: 275
Quote:
 Originally Posted by traineeinvestor Any of 13, 34 and 45 can be supported with logic which I suppose is the whole point of the exercise.
Yep, I'm waiting to see what answer tells you about "you"

07-21-2017, 07:33 AM   #15
Full time employment: Posting here.

Join Date: May 2013
Posts: 750
Quote:
 Originally Posted by Philliefan33 34 I should move this to the "pet peeves" post. Puzzles like this are nice little brain teasers, but the syntax is totally nonsensical and are like nails on a chalkboard to me. The + and = symbols have very specific meaning. One should not just throw around terms such as " 2+5=12". It is bad math grammar.
__________________
Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.” ― Kenneth Grahame, The Wind in the Willows

 07-21-2017, 07:34 AM #16 Full time employment: Posting here.   Join Date: Jan 2011 Location: Just North of Boston, Soon on way to Maine Posts: 660 on first look I can see at least 3 answers that could work.... 34, 37 or 45, but I could probably find more that would work also. The problem with questions like this is it is a more sophisticated version of if a+b=17, what is the value of A?
07-21-2017, 07:35 AM   #17
Full time employment: Posting here.

Join Date: Jan 2011
Location: Just North of Boston, Soon on way to Maine
Posts: 660
Quote:
 Originally Posted by Philliefan33 34 I should move this to the "pet peeves" post. Puzzles like this are nice little brain teasers, but the syntax is totally nonsensical and are like nails on a chalkboard to me. The + and = symbols have very specific meaning. One should not just throw around terms such as " 2+5=12". It is bad math grammar.
+1

 07-21-2017, 07:35 AM #18 Recycles dryer sheets   Join Date: Feb 2017 Location: Severn Posts: 435 34
07-21-2017, 07:48 AM   #19
Thinks s/he gets paid by the post

Join Date: Jul 2007
Posts: 2,042
Quote:
 Originally Posted by Philliefan33 34 It is bad math grammar.
Agree, math sequence puzzles usually have commas between the numbers, that's why I picked 13.

 07-21-2017, 07:52 AM #20 Thinks s/he gets paid by the post   Join Date: Oct 2008 Posts: 1,638 Reminds me of those aptitude tests that you had to take in high school. You saw many different possible answers to one question, and you wondered if the folks who wrote the questions even realized that !! __________________

 Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post JohnnTexas FIRE and Money 16 12-26-2016 08:02 AM Going Sailing Stock Picking and Market Strategy 5 08-06-2016 07:38 AM HsiaoChu Other topics 20 03-29-2010 09:18 AM wabmester Other topics 8 08-26-2005 12:17 PM