Circle of Children
Math brain teasers require computations to solve.
A number of children are standing in a circle. They are evenly spaced and the 7th child is directly opposite the 18th child. How many children are there altogether?
HintHow many children are in half of the circle?
Hide
Answer
22; in half of the circle there are 11 children because 18-7=11. Multiply 11x2=22!
Hide
Comments
onlyeeyore  
Jun 15, 2005
| As usual I got this math teaser the long way. I've got to bone up on my algebra!  |
Riddlerman  
Jun 15, 2005
| Algebra ain't anything to do with it. Just figure 10 kids either side of them (10) Double it as there are two sides (20), then add the two kids themselves (22)
Bit EZ but i enjoyed it. Thanks.  |
sk8ergrl 
Jun 15, 2005
| riddle is right. There is nothing to do with Algebra. I'm glad everyone seems to like it |
BrUnEttEcUtiE 
Jun 15, 2005
| We do these as bonus questions in school all the time!  |
sweetime
Jun 15, 2005
| my brain hurts
i got 20 but i'm not entirely sure how |
tamjp
Jun 16, 2005
|  I needed the hint.
but ast least then I got it! 
good one! |
PCDguitar
Jun 17, 2005
| good 1 even tho i dont understand y u need to subtract 7 from 18 to get 11 to multiplay it by two? |
Question_Mark
Jun 17, 2005
| Simple, but good. |
froggygg
Jun 22, 2005
| Good teaser! |
amanduh05
Jun 23, 2005
| good 1 |
sk8ergrl
Mar 20, 2006
| Thanx!!!  |
tintiniscool
Aug 06, 2006
| Fun! |
opqpop
Sep 11, 2010
| I'm such an idiot. I figured out there were 10 kids on the right, and then figured out there were 6 kids before the 7th kid on the left, and hence 4 kids after the 18th kid to the left, for a total of 18 + 4 = 22 kids.
Then I realized I could have just doubled 10 and added 2.
Sigh I'm ashamed of my stupidity. |
doctapeppaman
Sep 27, 2012
| The solution assumes that the children are arranged consecutively around the circle. |
Back to Top
| |
|
