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Math Help - Chain Mail Problem

  1. #1
    Junior Member mathbuoy's Avatar
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    Thumbs down Chain Mail Problem

    Hi can anyone help me with this question pls? thank you!


    On 1st January the manager of a large organisation learns that the company is about to be taken
    over. He sends emails to five colleagues to inform them of the news.
    On 2nd January these five colleagues each send out five emails informing other colleagues.
    On 3rd January those colleagues who heard the news on the 2nd January each send out four
    emails informing other colleagues.
    On 4th January those colleagues who heard the news on 3rd January each send out ten emails
    informing other colleagues.
    On the first three days that the rumour of this take-over was being spread, recipients of the
    information only received one email each. On the 4th January, however, two-thirds of recipients
    received emails from two different colleagues informing them of the news. The remainder just
    received one email.
    How many colleagues received two emails on the 4th January?
    A 200
    B 300
    C 400
    D 500
    E 600


    ans C
    Last edited by mr fantastic; May 11th 2011 at 03:38 AM. Reason: Removed quyote tags to make it easier to quote question in replies.
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  2. #2
    MHF Contributor
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    It would be great to see your development of the string of emails.

    Jan 0 - 1 Colleague
    Jan 1 - +5 Total 6
    Jan 2 - +25 Total 31

    What's next?
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  3. #3
    Junior Member mathbuoy's Avatar
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    Jan 3- +100 total 131
    Jan 4- +1000 total 1131

    is that so?
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  4. #4
    MHF Contributor
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    That's the way I read it. Now what?

    There were 1000 emails. Where did they go?
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