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There is one kind of Farreri seated-wheel such that all

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There is one kind of Farreri seated-wheel such that all [#permalink] New post 26 Nov 2005, 06:39
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24. There is one kind of Farreri seated-wheel such that all seats are numbered from 1 to n inclusive. If one seat number is 3, and before it, there is another opposite seat number 18, then what is the value of n?

A. 26
B. 28
C. 30
D. 32
E. 34

(I do not understand what this question is asking...not at all! I'm totally at a loss here...)
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Last edited by gamjatang on 30 Nov 2005, 23:28, edited 1 time in total.
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Re: PS - (AG) Farreri seated-wheel [#permalink] New post 26 Nov 2005, 19:58
gamjatang wrote:
24. There is one kind of Farreri seated-wheel such that all seats are numbered from 1 to n inclusive. If one seat number is 3, and before it, there is another opposite seat number 18, then what is the value of n?

A. 26
B. 28
C. 30
D. 32
E. 34

(I do not understand what this question is asking...not at all! I'm totally at a loss here...)


since the Farreri seated-wheel is a wheel ...the position of any two seats toward e/other is not fixed...it changes according to the rotation of the wheel around its centre ...the case in which seat 18 is in front of seat 3 is that they're two ends of a diameter of the wheel and they're opposite when this diameter is parallel to the horizon . Since they're a diameter, we have 18-3=1/2 n ---> n=30

well, i'm not so sure anyway ....
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Re: PS - (AG) Farreri seated-wheel [#permalink] New post 26 Nov 2005, 22:27
laxieqv wrote:
gamjatang wrote:
24. There is one kind of Farreri seated-wheel such that all seats are numbered from 1 to n inclusive. If one seat number is 3, and before it, there is another opposite seat number 18, then what is the value of n?
A. 26
B. 28
C. 30
D. 32
E. 34
(I do not understand what this question is asking...not at all! I'm totally at a loss here...)

since the Farreri seated-wheel is a wheel ...the position of any two seats toward e/other is not fixed...it changes according to the rotation of the wheel around its centre ...the case in which seat 18 is in front of seat 3 is that they're two ends of a diameter of the wheel and they're opposite when this diameter is parallel to the horizon . Since they're a diameter, we have 18-3=1/2 n ---> n=30
well, i'm not so sure anyway ....

half circle makes = (18-3) seats=15 seats
full circle makes = 15x2=30 seats
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 [#permalink] New post 26 Nov 2005, 23:57
Let x be the number of seats b/w 3 and 18 on either sides (excluding 3 and 18).
n=2x+2
x=(18-3)-1=14
So,
n=28+2
n=30
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 [#permalink] New post 27 Nov 2005, 05:38
Brilliant you guys are!

The OA is 30.

However, I thought this way (which is oviously wrong).

The opposite of 3 is 18.
The opposite of 2 should be 19.
The opposite of 1 should be 20.
(-_-)

I still don't know why the OA is 30.
And I do not understand laxie's / gsr's / himalaya's explanations.

Could somebody draw a picture of that wheel for me, please???
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 [#permalink] New post 27 Nov 2005, 05:53
here is the illustration:
Attachments

wheel.doc [23.5 KiB]
Downloaded 42 times

To download please login or register as a user

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 [#permalink] New post 27 Nov 2005, 06:21
gamjatang wrote:
Brilliant you guys are!

The OA is 30.
However, I thought this way (which is oviously wrong).
The opposite of 3 is 18.
The opposite of 2 should be 19.
The opposite of 1 should be 20.
(-_-)
I still don't know why the OA is 30.
And I do not understand laxie's / gsr's / himalaya's explanations.
Could somebody draw a picture of that wheel for me, please???


laxi did gr8 job. i think the credit goes to laxi and his gf. :wink:
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 [#permalink] New post 27 Nov 2005, 06:38
HIMALAYA wrote:
gamjatang wrote:
Brilliant you guys are!

The OA is 30.
However, I thought this way (which is oviously wrong).
The opposite of 3 is 18.
The opposite of 2 should be 19.
The opposite of 1 should be 20.
(-_-)
I still don't know why the OA is 30.
And I do not understand laxie's / gsr's / himalaya's explanations.
Could somebody draw a picture of that wheel for me, please???


laxi did gr8 job. i think the credit goes to laxi and his gf. :wink:


hik, are you saying that i and my partner sitting in seat numbers 3 and 18 ...lovefully staring at e/other?!!! :roll: ...hey , again, i'm a girl , not a boy!!! :oops:
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 [#permalink] New post 27 Nov 2005, 08:24
laxieqv wrote:
HIMALAYA wrote:
gamjatang wrote:
Brilliant you guys are!

The OA is 30.
However, I thought this way (which is oviously wrong).
The opposite of 3 is 18.
The opposite of 2 should be 19.
The opposite of 1 should be 20.
(-_-)
I still don't know why the OA is 30.
And I do not understand laxie's / gsr's / himalaya's explanations.
Could somebody draw a picture of that wheel for me, please???


laxi did gr8 job. i think the credit goes to laxi and his gf. :wink:


hik, are you saying that i and my partner sitting in seat numbers 3 and 18 ...lovefully staring at e/other?!!! :roll: ...hey , again, i'm a girl , not a boy!!! :oops:


yes i know. but donot u know that the one who is sitting in 18 is me? :wink:
  [#permalink] 27 Nov 2005, 08:24
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There is one kind of Farreri seated-wheel such that all

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