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Dec 18, 2006

Mind Exercise: Number Series

Sharpen your mind and exercise your brain with this number series mind puzzle. Mind and mental exercises such as this mind teaser help to keep your brain young.

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Exercise:

Examine the following series of numbers and replace the question mark with the correct number:

0,3,9,18,21,27,36,?

Source: The Complete Book of Fun Maths, Philip Carter & Ken Russell

Solution here



Comments
Sep 9, 2008 7:59 AM
Guest :
39
Sep 9, 2008 3:36 PM
Guest :
it's 39
Sep 9, 2008 5:45 PM
Guest :
41
Sep 11, 2008 7:45 PM
Guest :
72
Sep 11, 2008 7:45 PM
Guest :
i think its 72
Sep 13, 2008 8:48 AM
Guest :
39
Sep 17, 2008 11:47 AM
Guest :
39!
Sep 21, 2008 8:21 PM
Guest :
39
Sep 23, 2008 11:47 PM
Guest :
Answer is 39, right?
Sep 26, 2008 3:33 PM
Guest :
3-6-9 incremantal order
so 39
Sep 30, 2008 7:05 AM
Guest :
39
Oct 13, 2008 10:48 AM
Guest :
42
Oct 19, 2008 7:02 PM
Guest :
39
Oct 21, 2008 9:59 AM
Guest :
39
Oct 21, 2008 10:00 AM
Guest :
39 hehehe
Oct 28, 2008 5:42 AM
Guest :
39
Nov 4, 2008 4:14 PM
Guest :
he he he
Nov 22, 2008 4:57 PM
Guest :
39
Dec 1, 2008 12:53 PM
Guest :
39
Dec 11, 2008 10:15 AM
Guest :
0+3=3, 3+6=9, 9+9=18, 18+3=21, 21+6=27, 27+9=36, 36+3+39
Dec 22, 2008 12:18 PM
Guest :
42?
Dec 23, 2008 1:55 PM
Guest :
39... the series follows +3 +6 +9 and repeats
Dec 25, 2008 4:29 AM
Guest :
39
Jan 2, 2009 9:13 PM
Guest :
39 is the answer, the series goes add 3+6+9
Jan 8, 2009 6:31 PM
Guest :
It is definitely 39!!!
Jan 17, 2009 1:05 AM
Guest :
i think it 39 becoz 0-3 has different 3 and 3-9 has different 6 and 9-18 has 9 and it repeat again different 3 18-21 and it different is in sreies 3,6,9,3,6,9...........
26 Comments
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