Nationally recognised maths arithmetic competitions/quizzes

Discussion in 'General Discussion' started by geek84, 16 Jun 2018.

  1. geek84

    geek84

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    Hi Folks

    I hope you're all well. I quite enjoy answering maths arithmetic questions.

    Is anybody aware of any nationally recognized maths arithmetic quizzes or competitions that I could take part in?


    Thanks in advance for your responses
     
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  3. Bonni

    Bonni

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    To complete a job, it takes

    2 hours for Sarah + Dave
    3 hours for Sarah + Brian
    4 Hours for Dave + Brian

    How long will the job take if all three work together?
     
  4. bernardgreen

    bernardgreen

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    At least two hours, there are only two spades available
     
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  5. bernardgreen

    bernardgreen

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  6. Notch7

    Notch7

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    Im guessing it needs a quadratic equation to solve?
     
  7. Ihavenojob

    Ihavenojob

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    Some threesomes don't take long, but this would be 4.5 hours .
     
  8. 83% gutted. 3 wrong???
     
  9. concurr.
     
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  11. simultaneous equation.
     
  12. Notch7

    Notch7

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    Thanks

    Yes thats what I meant!

    'O' level maths was a while back!
     
  13. rsgaz

    rsgaz

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    Is it 1 hour, 50 minutes and 46 seconds?! :p:p
     
  14. Ian H

    Ian H

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    2 hours. Get Brian to watch.
     
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  15. EFLImpudence

    EFLImpudence

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    I've been looking at this puzzle off and on and I have just reailsed - if I'm right.

    I think rsgaz is correct - but then, so is Ian. :)
     
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  16. rsgaz

    rsgaz

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    Skip to 3:20 for the solution...

     
  17. EFLImpudence

    EFLImpudence

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    I did it slightly differently - if you're interested.

    In 1 hr
    S&D do half the job.....6 twelfths
    S&B do a third............4 twelfths
    D&B do a quarter........3 twelfths

    I.e in an hour double the workers (could) do 13 twelfths of the job,
    so one lot of the three do half that; 13 twenty-fourths of the job in an hour,
    so to finish will take a further 11 thirteenths of hour.

    I.e. 1 hr 50.77 mins.
     
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