Maths puzzles
10 July 2003, 11:20 PM
#1
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Without using a calculator or pen and paper add up
one thousand + forty + one thousand + thirty + one thousand + twenty + one thousand plus ten
What do you get?
Does anyone know anymore of these
Ta
Si
one thousand + forty + one thousand + thirty + one thousand + twenty + one thousand plus ten
What do you get?
Does anyone know anymore of these
Ta
Si
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10 July 2003, 11:39 PM
#10
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mj i've read it out to young and old even a mensa member (162) all come back with 5000, it is any easy sum but it just fools the brain that's all.
10 July 2003, 11:44 PM
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fair play, I could image the brain would interpret it differently if "heard" , as opposed to "read" - reading - you can read a couple of times - hearing you are more on the spot & prone to the bum answer.
11 July 2003, 07:37 AM
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The hypotenuse of the red and green triangles do not line up - they are at slightly different angles which the naked eye cannot easilly detect. Therefore the whole shape is NOT a triangle.
The 'error' accounts for the missing space.
The 'error' accounts for the missing space.
13 July 2003, 10:13 AM
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I drew this to scale on a 1cm x 1cm grid.
It is not curved hypotenuse that cause it - all these shapes are drawn straight - the two hypotenuse of the green & red triangles not not exactly follow the hypotenuse of the true 13x5 blue triangle.
It is not curved hypotenuse that cause it - all these shapes are drawn straight - the two hypotenuse of the green & red triangles not not exactly follow the hypotenuse of the true 13x5 blue triangle.
13 July 2003, 07:34 PM
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Took me quite a few go's before I realised how incredibly obvious that one is. Won't spoil it for everyone yet, as it had me going for a minute or two.
13 July 2003, 07:36 PM
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The two hypotenuse are actually convex and concave curves.
As for the crystal ball thing...
15 July 2003, 09:16 AM
#27
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if you choose
10 your shape will be answer 9 (10 - 1)
11 your shape will be answer 9 (11 - 2)
12 your shape will be answer 9 (12 - 3)
20 to 29 answer will be 18
30 to 39 answer will be 27
40 to 49 answer will be 36
50 to 59 answer will be 45
60 to 69 (fnarr fnarr) answer will be 54
70 to 79 answer will be 63
80 to 89 answer will be 72
90 to 99 answer will be 81
if you look at number 9, 18, 27 etc they are the same shape, although shape changes every time
Si
10 your shape will be answer 9 (10 - 1)
11 your shape will be answer 9 (11 - 2)
12 your shape will be answer 9 (12 - 3)
20 to 29 answer will be 18
30 to 39 answer will be 27
40 to 49 answer will be 36
50 to 59 answer will be 45
60 to 69 (fnarr fnarr) answer will be 54
70 to 79 answer will be 63
80 to 89 answer will be 72
90 to 99 answer will be 81
if you look at number 9, 18, 27 etc they are the same shape, although shape changes every time
Si
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