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Working simultaneously and independently at an identical con

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mitzwillrockgmat Master | Next Rank: 500 Posts Default Avatar
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Working simultaneously and independently at an identical con

Post Mon May 24, 2010 4:43 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Working simultaneously and independently at an identical constant rate, 4 machines of a
    certain type can produce a total of x units of product P in 6 days. How many of these
    machines, working simultaneously and independently at this constant rate, can produce a
    total of 3x units of product P in 4 days?

    A. 24
    B. 18
    C. 16
    D. 12
    E. 8

    Can someone break this down for me logically, in words. thanks Smile

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    liferocks Legendary Member Default Avatar
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    Post Mon May 24, 2010 4:49 am
    4 machines make x units in 6 days

    so x units are prepared in 6*4 machine days
    so 3x units are prepared in 3*6*4 machine days

    if number of days is 4, number of machines will be 3*6*4/4=18

    Ans option B

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