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rates

This topic has 1 member reply
yvonne12 Master | Next Rank: 500 Posts Default Avatar
Joined
07 Feb 2007
Posted:
144 messages

rates

Post Sun Mar 04, 2007 12:20 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    I want to know if I did this right.

    six machines working at a constant rate together can complete a certain job in 12 days. How many additional machines each working at the same constant rate will be needed to complete the job in 8 days?

    ans 3
    6/x = x/8 cross multiply and get 3

    is this correct?

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    jayhawk2001 Community Manager
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    Post Sun Mar 04, 2007 6:03 pm
    Use the standard rate-formula to solve this

    6 machines complete the job in 12 days, so
    6 * 1/x = 1/12, so x = 72

    n additional machines complete the job in 8 days
    (n+6) * 1/72 = 1/8

    So, n = 3

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