
« : May 17, 2007, 09:25:15 PM From Prateek» 

What is 10 + 10? 1+1=0; 2+2=0; 3+3=0; 4+4=2; 5+5=0; 6+6=2; 7+7=0;8+8=2;9+9=2; 10+10=? Given the following information, what is 10 + 10? 1+1=0; 2+2=0; 3+3=0; 4+4=2; 5+5=0; 6+6=2; 7+7=0; 8+8=4; 9+9=2; 10+10=? Note: Supposedly this riddle is from an application to a Japanese kindergarten! Sorry Guys, 8+8 =4. This is the right question and has a very convincing answer. Figure it out else will tell the correct answer by tomorrow.






« #2 : May 27, 2007, 12:08:15 PM From PSM» 

is answer 4 ............. reply...the answer




« #3 : May 27, 2007, 12:41:34 PM From Prateek» 

The answer is zero.
Reason:
10+10 can be written as
6+6+4+4 = 2+2 = 0 9+9+2 = 2+2 = 0
and so on.




« #4 : May 27, 2007, 12:46:04 PM From PSM» 

According to u prateek 4+4 should have been 0 because
4+4= 2+2+2+2=0+0=0
or 3+3+1+1=0+0=0
but it is given 2 so u r wrong............




« #5 : May 27, 2007, 12:48:00 PM From Ria» 

Use only known equations. 0+0 is not known.




« #6 : May 27, 2007, 12:55:28 PM From PSM» 

means if 10+10 is 0 then 5+5+5+5 = 0 means 0+0=0 then u r contradicting u self???




« #7 : May 27, 2007, 01:04:38 PM From A» 

Oh oh... From your point of view the question itself can be declared wrong. 1+1 can never be 0 (unless binary, ofcourse)... and so do the rest of the summation! 6+6 is given as 2 6+6=3+3+3+3=0+0=2 ( ?) So I don't think one can apply reverse mathematics to it! However, even I don't know the exact answer. So I too am waiting for someone to give me the right answer.




« #8 : May 27, 2007, 01:23:30 PM From vibhuti» 

since the prime no add is 0... 10+10 will be two... 10+10=2




« #9 : May 27, 2007, 01:39:49 PM From PSM» 

the question has been changed earlier it was 8+8=4 now it is 8+8=2.... at least say to all that u have changed the question........




« #10 : May 27, 2007, 01:47:57 PM From Poonam» 

Since this question was asked to Kindergarten teachers, I think they are supposed to answer 10+10=20! They will be teaching to students who might give wrong answers to all the questions, and I think, teachers should not forget their elemenatary mathematics being among them. May be this is just a funny of testing it.




« #11 : May 27, 2007, 02:14:24 PM From Prateek» 

Yeah I modified the puzzle to its correct form. Sorry, if you had spent more time on the initial version of the puzzle. My apologies to PSM.




« #12 : May 27, 2007, 04:12:19 PM From PSM» 

Vibhuti according to u 1 is a prime no...which is actually not........ so ur answer is also wrong.............but the most closest




« #13 : May 30, 2007, 11:47:25 AM From Neha» 

8+8 should be 4.. it was correct initillay.. if 8+8 is 4 then there is a convincing answer to this puzzle.. request the owner of the post to modify the question back to original.




« #14 : June 02, 2007, 01:50:32 AM From akshay» 

the answer is two the answer is based on factorising the number concerned we look as the no. of ways the number can be factorised excluding any factorisation which has the number 1 as part of it we multiply the no. of ways by two to get the answer
for 1 its 0 for 2 its 0 for 3 its 0 for 4 its 2 ( 4 = 2*2) for 5 its 0 for 6 its 2 ( 6 = 3*2) for 7 its 0 for 8 its 4 (8=2*2*2, 8=4*2) for 9 its 2 (9=3*3) for 10 its 2 (10=5*2)
so the answer is 2




« #15 : June 02, 2007, 09:31:41 AM From ankit khanna» 

10+10=2



Lets consider this. Let the formula be 4n,4n+1,4n+2==>10n(the total addition) else 0 where n=1,2,... (i.e) 1+1=0 2+2=0 3+3=0
4+4==>4(1)+4(1)==>n=1 Then 10(1)(4+4)=2
5+5==>(4(1)+1)+(4(1)+1)==>n=1 Then 10(1)(5+5)=0
6+6==>(4(1)+2)+(4(1)+2)==>n=1 Then 10(1)(6+6)==>2==>2 Hence 6+6==>2
7+7==>0
8+8==>(4(2)+4(2)) Then 20(8+8)==>4
9+9==>(4(2)+1)+(4(2)+1) Then 20(9+9)==>2
so,10+10==>(4(2)+2)+(4(2)+2) Then 20(10+10)==>0



i think its the number of circles int the representative form of the digit



here is answer 10 +10 = 6+4+6+4=6+6+4+4=2+2=0



