# Simple Math Question

Discussion in 'Physics & Math' started by deicider, Mar 1, 2011.

1. ### PeteIt's not rocket surgeryRegistered Senior Member

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10,166
I don't see any way of parsing the OP to get:
X = X + Y/2

The book costs its cost plus half the price? What?
It looks like you're trying to parse it two different ways and combine the result.
First you ignore the "plus half its price" bit to say the cost is 1, then you remember the bit you forgot to add half the price anyway.

Is that messing about? Or Taching away?

Once Tach started on that tack, he consistently had cost=y, price=x

The OP says that the book costs $1 plus half of its price. Cost =$1 + Price/2
y = 1 + x/2

Right?

Note that adding another equation: x=y then gives the easy answer of $2. 2. ### Google AdSenseGuest Advertisement to hide all adverts. 3. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member Messages: 18,696 The OP: What is the Cost of a book that costs 1$ plus half of its price?

Method 1
What is the Cost of a book that costs (1$) (plus half of its price)? Method 2 What is the Cost of a book that (costs 1$) (plus half of its price)?
See? Method 2 states that the book costs $1. Please Register or Log in to view the hidden image! No, I said that on the basis that it costs$1 the second portion is contradictory and should be ignored.

The word "cost" is used twice. Using method two maintains that by using "x" twice.

Agreed. Honestly.
I'm just of the opinion that if we're going to keep the thread open on a question that was answered on page 1 (in post 2, no less) then let's be adult Sci about it. Bring on the frivolity!

5. ### PeteIt's not rocket surgeryRegistered Senior Member

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10,166
Only for the buyer. For the seller, cost means what they paid for it, not the price they're charging the buyer.
So, it's a reasonable interpretation.

I'm beginning to wonder if that was the OP's intent... the use of two different words seems deliberate. It might be that the author thought that using only "cost" or "price" would sound awkward, but if they deliberately changed it for that reason then they should surely have considered the ambiguity that arises?

Try this:
Cost = $1, Price =$0
Cost = $1.50, Price =$1

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10,166
Where did the $1 go in your equation? You have already changed it to X, justified by ignoring the "plus half the price" and setting X=1. Then why are you arguing otherwise? Well, I still think that your post 106 is clearly wrong, and it doesn't look like frivolity. *grumpy hat on* Please Register or Log in to view the hidden image! 13. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member Messages: 18,696 Cost = X. The book "costs$1" (from the OP).

Bloody-mindedness and boredom.
For my next trick I'll try to show that it really does = Christmas cake.

14. ### PeteIt's not rocket surgeryRegistered Senior Member

Messages:
10,166
Isn't that what Tach said a couple of posts ago?
Maybe it's a Dan Brown novel.

$1 and$1.50 are *possible* but unlikely answers for the purchase cost / selling price interpretation.
Anything over \$2 is more reasonable.

15. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

Messages:
18,696
The book costs nothing because the Illuminati blew it up with anti matter while stealing the Mona Lisa.

16. ### deconsscrambled eggRegistered Senior Member

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144
"Cost" is not Star Trek, and "Price" is not Star Wars. This thread does not deserve this much attention even on a nerdy site.

"Doesn't anybody notice this? I feel like I'm taking crazy pills!"(*)

(*)http://www.imdb.com/title/tt0196229/quotes

17. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

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18,696
Since you're using movie quotes to support your point of view, here's one that supports ours:
Animal House.

18. ### deconsscrambled eggRegistered Senior Member

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144
A very useful quote. It can cover a number of my point of views.

19. ### EmilValued Senior Member

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2,789

Welcome among us! :worship:
Hang on, buddy. :itold:

20. ### DywyddyrPenguinaciously duckalicious.Valued Senior Member

Messages:
18,696
An equally useful one from the same film:
"You fucked up, you trusted us."

That's come in handy a few times!

21. ### Captain KremmenAll aboard, me Hearties!Valued Senior Member

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12,738
So what was the answer then?

22. ### BenTheManDr. of Physics, Prof. of LoveValued Senior Member

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8,967
This pretty much sums up most of SciForums.

Fortunately, it doesn't really sum up this forum

23. ### Captain KremmenAll aboard, me Hearties!Valued Senior Member

Messages:
12,738
OK Smartarse.