anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
I got 1/6 +1/x = 1/2 then 1/x = 1/2 -1/6 = 1/3
anonymous
  • anonymous
I got 1/x = 1/3 what's next?
ganeshie8
  • ganeshie8
your goal is to solve \(x\)

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anonymous
  • anonymous
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
ganeshie8
  • ganeshie8
1/x = 1/3 flip both sides and get x/1 = 3/1 which is same as x = 3
anonymous
  • anonymous
You just flip it? No math explanation?
ganeshie8
  • ganeshie8
flipping is mathematical. for nonzero real numbers, we have : \[\dfrac{a}{b} = \dfrac{c}{d} \implies \dfrac{b}{a}=\dfrac{d}{c}\]
anonymous
  • anonymous
Oh I thought when you flip it becomes \[x^-1 = 3\]
anonymous
  • anonymous
wait a minute I could've use cross multiply!!!
ganeshie8
  • ganeshie8
Yes you could do that too
anonymous
  • anonymous
Yeah thank you for lending me a hand. I'm doing crash course for my engineering math exit. Thank you!
ganeshie8
  • ganeshie8
np, good luck with the course!

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