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anonymous

  • one year ago

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. With the help of a newer model the job is complete in 2 hours. How long would it take the newer model to do the job alone?

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  1. anonymous
    • one year ago
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    I got 1/6 +1/x = 1/2 then 1/x = 1/2 -1/6 = 1/3

  2. anonymous
    • one year ago
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    I got 1/x = 1/3 what's next?

  3. ganeshie8
    • one year ago
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    your goal is to solve \(x\)

  4. anonymous
    • one year ago
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    Yeap I know but how would I translate 1/x to x=3 I know 3 is the answer but how will I get there

  5. ganeshie8
    • one year ago
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    1/x = 1/3 flip both sides and get x/1 = 3/1 which is same as x = 3

  6. anonymous
    • one year ago
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    You just flip it? No math explanation?

  7. ganeshie8
    • one year ago
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    flipping is mathematical. for nonzero real numbers, we have : \[\dfrac{a}{b} = \dfrac{c}{d} \implies \dfrac{b}{a}=\dfrac{d}{c}\]

  8. anonymous
    • one year ago
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    Oh I thought when you flip it becomes \[x^-1 = 3\]

  9. anonymous
    • one year ago
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    wait a minute I could've use cross multiply!!!

  10. ganeshie8
    • one year ago
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    Yes you could do that too

  11. anonymous
    • one year ago
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    Yeah thank you for lending me a hand. I'm doing crash course for my engineering math exit. Thank you!

  12. ganeshie8
    • one year ago
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    np, good luck with the course!

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