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maths question plz............. solve this question

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maths question plz............. solve this question

Postby bobbyprashanth » Wed Dec 09, 2009 8:26 pm

13. A person on tour has Rs. 360 for his daily expenses. If he extends his tour for 4 days he has to cut down his daily expenses by Rs. 3. Find the original duration of the tour.
bobbyprashanth
 
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Joined: Sun Nov 22, 2009 10:45 pm

Re: maths question plz............. solve this question

Postby Getenks » Fri Feb 05, 2010 8:49 am

Wed Dec 09 - The day this question was posted. And till now nobody cared/answered.

These forums are pretty much more like dead. (except for the Movies, TV celebrities part). :?: :!:

well the answer to you question :
Code: Select all
let the money he requires a day be x // we are assuming that he uses a fixed amount a day else this question is senseless.
let the number of days he took be y

=> 360=xy // the money each day x the days = 360
.:. x=360/y ___ @1

given that if he takes 4 more days he would have to use 3 Rs less a day
=> 360 = (y+4) (x-3)
=> 360 = xy -3y + 4x -12
=> 360 = (360/y)*y - 3y + (4*360/y) -12 --- putting @1 here
=> 360 = 360 -3y + (1440/y) -12
=> 360 - 360 + 12 = ((-3y^2 + 1440)/y)
=> 12=((-3y^2 + 1440)/y)
=> 12y = -3y^2 + 1440
=> 3y^2 + 12 -1440 = 0 // bringing all to the LHS
=> y^2 + 4y - 480 // dividing by 3
=> y^2 + 24y -20y - 480 =0
=> y(y+24) - 20(y+24) =0
=> (y-20) - (y+24) = 0
.:. y = 20 or y =-24
but whoah -24 cannot be a number of day - invalid  insensible
so y =20  - he takes 20 days
putting y=20 in @1
.:. we get x=18.


Answer: So he takes 20 days spending Rs18 per day .
Getenks
 
Posts: 11
Joined: Fri Feb 05, 2010 8:06 am

Re: maths question plz............. solve this question

Postby Getenks » Thu Mar 11, 2010 12:06 am

Is this some advertisement forum or something. What you posted was offending . What the hell are you doing ? this is a forum for logic and math. your ad was totally irrelevant and probably you need a BAN.
Getenks
 
Posts: 11
Joined: Fri Feb 05, 2010 8:06 am


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