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math

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Metal discs for pet collars have a diameter of 4cm. Each disc is 0.1cm thick. How many discs can be made from 1000cm3 of metal?

  • math - ,

    I don't like this question.

    There is simple purely mathematical solution
    volume of 1 disc = π(2^2)(.1) = .4π cm^3
    so number of discs = 1000/(.4π) or 795.8
    so they can make 795 discs

    Logistically, this is a very ambiguous question
    - is the 1000 cm^3 in a block of metal or in sheets?
    - are the discs manufactured by pouring liquid metal into a mould ?
    - are they stamped ? If so, is the scrap metal used again?
    - arhhh! ....

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