Join Early Retirement Today
Reply
 
Thread Tools Search this Thread Display Modes
Math logic puzzler for fun
Old 07-21-2017, 06:50 AM   #1
Give me a museum and I'll fill it. (Picasso)
Give me a forum ...
RunningBum's Avatar
 
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.
__________________

RunningBum is offline   Reply With Quote
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!

Old 07-21-2017, 06:54 AM   #2
Recycles dryer sheets
SteveNU's Avatar
 
Join Date: Feb 2010
Posts: 374
45
__________________

SteveNU is online now   Reply With Quote
Old 07-21-2017, 06:55 AM   #3
Recycles dryer sheets
DFA's Avatar
 
Join Date: Nov 2010
Location: Earth
Posts: 334
34
DFA is offline   Reply With Quote
Old 07-21-2017, 07:05 AM   #4
Thinks s/he gets paid by the post
zinger1457's Avatar
 
Join Date: Jul 2007
Posts: 2,042
Looks like a trick question, I'll go with 13.
zinger1457 is offline   Reply With Quote
Old 07-21-2017, 07:07 AM   #5
Recycles dryer sheets
Wheel's Avatar
 
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
Wheel is offline   Reply With Quote
Old 07-21-2017, 07:10 AM   #6
Recycles dryer sheets
 
Join Date: Jan 2017
Posts: 74
45
dasranger is offline   Reply With Quote
Old 07-21-2017, 07:11 AM   #7
Recycles dryer sheets
 
Join Date: Aug 2013
Posts: 275
34
bradaz2488 is offline   Reply With Quote
Old 07-21-2017, 07:11 AM   #8
Full time employment: Posting here.
FIREmenow's Avatar
 
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
FIREmenow is offline   Reply With Quote
Old 07-21-2017, 07:15 AM   #9
Thinks s/he gets paid by the post
Philliefan33's Avatar
 
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.
Philliefan33 is online now   Reply With Quote
Old 07-21-2017, 07:16 AM   #10
Thinks s/he gets paid by the post
John Galt III's Avatar
 
Join Date: Oct 2008
Posts: 1,638
Probably more than one answer. The one that stands out to me is 34.
John Galt III is offline   Reply With Quote
Old 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!"
scrabbler1 is online now   Reply With Quote
Old 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.
bw5972 is offline   Reply With Quote
Old 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.
traineeinvestor is offline   Reply With Quote
Old 07-21-2017, 07:28 AM   #14
Recycles dryer sheets
 
Join Date: Aug 2013
Posts: 275
Quote:
Originally Posted by traineeinvestor View Post
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"
bradaz2488 is offline   Reply With Quote
Old 07-21-2017, 07:33 AM   #15
Full time employment: Posting here.
FIREmenow's Avatar
 
Join Date: May 2013
Posts: 750
Quote:
Originally Posted by Philliefan33 View Post
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
FIREmenow is offline   Reply With Quote
Old 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?
ChiliPepr is online now   Reply With Quote
Old 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 View Post
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
ChiliPepr is online now   Reply With Quote
Old 07-21-2017, 07:35 AM   #18
Recycles dryer sheets
Lawrencewendall's Avatar
 
Join Date: Feb 2017
Location: Severn
Posts: 435
34
Lawrencewendall is offline   Reply With Quote
Old 07-21-2017, 07:48 AM   #19
Thinks s/he gets paid by the post
zinger1457's Avatar
 
Join Date: Jul 2007
Posts: 2,042
Quote:
Originally Posted by Philliefan33 View Post
34
It is bad math grammar.
Agree, math sequence puzzles usually have commas between the numbers, that's why I picked 13.
zinger1457 is offline   Reply With Quote
Old 07-21-2017, 07:52 AM   #20
Thinks s/he gets paid by the post
John Galt III's Avatar
 
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 !!
__________________

John Galt III is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Retirement Math Logic JohnnTexas FIRE and Money 16 12-26-2016 08:02 AM
No Big Fun to Realize in the Fun Account Going Sailing Stock Picking and Market Strategy 5 08-06-2016 07:38 AM
Jobs that only recently were mostly fun and now are "not fun at all"... HsiaoChu Other topics 20 03-29-2010 09:18 AM
Friday Puzzler wabmester Other topics 8 08-26-2005 12:17 PM

» Quick Links

 
All times are GMT -6. The time now is 11:37 AM.
 
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.