Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Personal Links
Submit a Teaser
Your Favorites
Your Watchlist
Browse Teasers
All

Cryptography
Group
Language
Letter-Equations
Logic
Logic-Grid
Math
Mystery
Optical-Illusions
Other
Probability
Rebus
Riddle
Science
Series
Situation
Trick
Trivia

Random
Daily Teasers
Search Teasers

Advanced Search
Add to Google Add to del.icio.us

More ways to get Braingle...

Troubling Doubling at School

Math brain teasers require computations to solve.

 

Puzzle ID:#49613
Fun:*** (2.91)
Difficulty:** (1.82)
Category:Math
Submitted By:dalfamnestAnz*******

 

 

 



Read the little poem and answer its question if you can.

The number of girls who do wear a watch
is double the number who don't.
But the number of boys who do not wear a watch
is double the number who do.

If I tell you the number of girls in my class
is double the number of boys,
Can you tell me the number I teach? Here's a clue:
More than 20; below 32!

Open Calculator




What Next?

  
  

See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.

 



Comments

kittygirl19cus*
Sep 27, 2012

First!
Marpleen*
Oct 02, 2012

Second!
RRAMMOHAN*in*
Oct 07, 2012

A bit tricky, but got it! Nice and simple explanation for the solution.
Babe*
Dec 20, 2012

Fourth! I do not even tempt to figure these out. Not good at math, plus it is not myfavorite to do! Sorry!
jaycr*us*
Dec 20, 2012

Hmm, this could be interesting...
HABS2933Aca*
Dec 20, 2012

Fairly easy, but still fun. Though not for everyone, I do enjoy math (and most other subjects for that matter).
HABS2933Aca*
Dec 20, 2012

Fairly easy, but still fun. Though not for everyone, I do enjoy math (and most other subjects for that matter).
iggy39Aus*
Dec 20, 2012

Me too Babe, I don't have the brain to work these out.
dsjtus*
Dec 21, 2012

dalfamnest, can you please explain how you know that the boys must be a multiple of three so that those of us who did not find it obvious can learn?
dalfamnestAnz*
Jan 06, 2013

Hi dsjt...and others. Because the number who 'do' is double the number who 'don't', there must be TWO who 'do' for every ONE who 'doesn't'. So you could arrange them in groups of THREE - 2 who 'do' with 1 who 'doesn't'. The total number must therefore be a multiple of THREE.

I hope that helps - sorry for the delay replying ... I've had a holiday!

Happy New Year to all - keep enjoying this site!



Back to Top
   



Users in Chat : None 

Online Now: 12 users and 429 guests

Copyright © 1999-2014 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search





Sign In A Create a free account