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PostPosted: Fri Feb 06, 2009 9:45 pm 
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A "Chiffres" problem from "Des Chiffres et Des Lettres". Sent in by a "telespectatrice", this one on the show would be to do mentally ASAP>

(((540 X 14)/9 - 45) / 15) + 7


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PostPosted: Fri Feb 06, 2009 9:49 pm 
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60

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PostPosted: Fri Feb 06, 2009 9:50 pm 
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I get between 6 and 7 which can't be right

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PostPosted: Fri Feb 06, 2009 9:51 pm 
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No math


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PostPosted: Fri Feb 06, 2009 9:51 pm 
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(((540 X 14)/9 - 45) / 15) + 7

60, I think. That was like sewing black on black. I don't want to do it again to double-check.

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PostPosted: Fri Feb 06, 2009 9:52 pm 
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I think I missed a decimal place

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PostPosted: Fri Feb 06, 2009 9:53 pm 
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60 it is.

IF Flyboy were here, he would probably point out that the "easiest" way of doing this mentally is to run through the division by 15, first. And then the division by 9

Which leaves:

((36 X 14)/9 - 3) + 7

and then

(4 x 14) - 3 + 7

60.

Both Christophe and Olivier got it rather faster than I did, watching.


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PostPosted: Fri Feb 06, 2009 9:55 pm 
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Yeh, you need the same fortitude as a middleweight champ to do mental math. NOT. quite.


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PostPosted: Sat Feb 07, 2009 12:31 am 
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I thought this was FNGD. Why am I seeing Fifth Grader questions?

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PostPosted: Sat Feb 07, 2009 12:40 am 
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ulysses5019 wrote:
I thought this was FNGD. Why am I seeing Fifth Grader questions?


To find out if you are smarter, of course......

Because the only current game show I am watching reguiarly on TV is "Des Chiffres et Des Lettres", from France.


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PostPosted: Sat Feb 07, 2009 11:54 am 
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etaoin22 wrote:
A "Chiffres" problem from "Des Chiffres et Des Lettres". Sent in by a "telespectatrice", this one on the show would be to do mentally ASAP>

(((540 X 14)/9 - 45) / 15) + 7


There must be some way to do this in one's head - I didn't.

I use pencil and paper to get 60.


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PostPosted: Sat Feb 07, 2009 11:56 am 
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etaoin22 wrote:
60 it is.

IF Flyboy were here, he would probably point out that the "easiest" way of doing this mentally is to run through the division by 15, first. And then the division by 9

Which leaves:

((36 X 14)/9 - 3) + 7

and then

(4 x 14) - 3 + 7

60.

Both Christophe and Olivier got it rather faster than I did, watching.


lol - even the explanation makes me head spin.


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