Maths question... My maths sucks ;)

Discussion in 'Off Topic / Chit-Chat' started by Steve Smith, 26 Mar 2009.

  1. Steve Smith

    Steve Smith Member

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    4,428
    Location:
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    Ok, random question here. I have two mate's arguing about there mileage on their cycle computers, and it's been established that one of the cycle computers is wrong :lol:

    Anywho, the cycle computer at fault has done 54 miles total. We also know that over a 4.35 mile journey, the incorrect computer claims to have done 4.25 miles. How would you work out what the total should be?
     
  2. a1Matt

    a1Matt Member

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    Location:
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    The duff computer loses 2.3% each journey. (as 4.25/4.35=0.977, and 100 - 97.7 = 2.3)
    54 miles plus 2.3% = 55.24miles

    I have not done maths for over 10 years now so I could be talking cr*p :rolleyes:
     
  3. Steve Smith

    Steve Smith Member

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    4,428
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    Awesome, thanks Matt. I'm chatting to one of my mates via IM and he'd somehow come up with that figure, but he wasn't completely sure :D
     
  4. Egmel

    Egmel Member

    Messages:
    724
    Location:
    Guildford, Surrey, UK
    actual A / reading A = actual B / reading B
    ( actual A / reading A ) * reading B = actual B
    (4.35/4.25)*54 = 55.27

    Assuming that it's a constant and linear under-reading.

    *edit, sounds like he's got it set up for the wrong sized wheels.
     
  5. Steve Smith

    Steve Smith Member

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    4,428
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    Leamington Spa, UK.
    Yeah, that's what we figured out before getting to the maths part ;)
     
  6. a1Matt

    a1Matt Member

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    Bromley
    looks like I'm not wheely good at maths then :( (or puns :lol: )
     
  7. Steve Smith

    Steve Smith Member

    Messages:
    4,428
    Location:
    Leamington Spa, UK.
    Oh dear..

    Here's their mileometre:

    http://dave.zoit.net/cycle.php

    *edit - the funny thing is, I've done way more than both of them, as I cycle 5 miles a day to work and back, whereas they cycle evenings/weekends and very occasionally at the moment (fair weather cyclists :lol:) I'm not keeping count but I'd be on about 200 - 250 miles by now, easily...
     
  8. a1Matt

    a1Matt Member

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    2,498
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    So who is going to be the first person to put the bike upside down and sit there cranking the pedals around :lol:

    I used to do near enough a thousand miles a month when I was a teenager!!! A friend and me used to just cycle every waking minute we had spare.
     
  9. Nick16

    Nick16 Member

    Messages:
    1,761
    Location:
    Surrey, UK
    join the club, although my miles are normally clocked up doing trails halfway up some silly hill in the half dark!

    puns = :oops:
     

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