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Post by lionking on Oct 28, 2008 5:15:04 GMT -4
For you smart people here, if you can discover a trick or so behind this:
Multiply the number of your male brothers by2
add 3
multiply the total number by 5
add the number of your female sisters
multiply by 10
add the number of the living grandmother/grandfather you have]
decrease 150 from the total
the number to the right is the number of your living grandfathre/grandmother...right?
the middle number is the number of your sisters...right?
the left number is the number of your brothers...right?
is there any trick behind it like confusing the person with "useless" additions or subtractions..or what?
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Post by Tanalia on Oct 28, 2008 6:02:58 GMT -4
Simple algebra. Let the three numbers you have to provide be: m - male f - female g - grandparents (living) Then the steps give: 2m 2m+3 10m+15 10m+f+15 100m+10f+150 100m+10f+g+150 100m+10f+g There are a lot of "tricks" like this, and yes, all the values and operations are just to obscure the fact that you are multiplying by 10 or 100 to shift the values. Note that it will be wrong for a person in a large family with more than 9 sisters  |
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Post by lionking on Oct 28, 2008 6:31:06 GMT -4
I knew there is something like this behind it. thnx Tanalia
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Jason
Pluto
May all your hits be crits
Posts: 5,579
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Post by Jason on Oct 28, 2008 10:46:20 GMT -4
Good thing it asks for male brothers and female sisters, and not the other way around.
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Post by BertL on Oct 29, 2008 13:03:31 GMT -4
What if you don't have any grandparents, brothers and sisters?
It worked for me. I have 2 brothers, no sisters and no grandparents left. I guess it's another one of those "9 times X, split the number and add all numbers up and you have 9 again!" things. But as Tanalia explained, it's simple algebra.
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Post by lionking on Oct 30, 2008 2:34:55 GMT -4
you ignore the part of calculation related to the missing brothers or sisters or grandparents alive.
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Post by bazbear on Nov 27, 2008 21:26:50 GMT -4
you ignore the part of calculation related to the missing brothers or sisters or grandparents alive. It matters not LK, these sorts math tricks have been around for at least as long as I've been alive (and I'm certain a heck of lot..centuries at least...longer)  |
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Post by lionking on Nov 29, 2008 13:04:36 GMT -4
you ignore the part of calculation related to the missing brothers or sisters or grandparents alive. It matters not LK, these sorts math tricks have been around for at least as long as I've been alive (and I'm certain a heck of lot..centuries at least...longer) Althoug hI never like d mathematics at school, except in class 8, I acknowledge that it can be fun. The relationship between the numbers and the rules that controls the math,.... after getting out of school, I could see it is nice and I regret not looking at them from the nice part.. Just today I was remembering that the angels of the triangle should all sum up to 180, no matter what is the type of the triangle [isosceles, equilateral...], and it is the same as the degree of the straight line. I remembered too how we were asked to prove something is parallel or isosceles or whatever... Today, I would like to re solve these problems. I definitely wouldn't loook at math the same as I did when I had to study it inspite of me and monitor the grades that I would get.. |
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Post by jaydeehess on Dec 1, 2008 0:38:07 GMT -4
What if you don't have any grandparents, brothers and sisters? Then the final number becomes 0, or if you prefer, 000. 0 brothers 0 sisters 0 living grandparents |
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