anonymous
  • anonymous
Help please? With steps?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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e.mccormick
  • e.mccormick
How far did you get with this?
anonymous
  • anonymous
Hold on a second please, I'm writing.

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e.mccormick
  • e.mccormick
Kk. Cause I do have a path to the answer...
anonymous
  • anonymous
\[\frac{ 72 }{ 2 } + \frac{ 72 }{ x } = \frac{ 72 }{ 1.5 }?\]
e.mccormick
  • e.mccormick
hmm... I can see where you got the 72/2 and 72/1.5.... but the 72/x makes no sense to me.
anonymous
  • anonymous
Sorry, I was looking at the example in my book, and tried to model it like it.
e.mccormick
  • e.mccormick
\(c_1 cpm=\frac{72}{2}\) and \(c_2 cpm=?\) Where cpm is Copies Per Minute \(1.5(c_1 cpm+c_2 cpm)=72\)
e.mccormick
  • e.mccormick
Once you know the CPM for the old copier, you can find out how long it takes to make 72 copies.
anonymous
  • anonymous
Sorry, I was writing this down.
e.mccormick
  • e.mccormick
Your method might actually do that in one shot, don't know. You could run it both ways and see.
anonymous
  • anonymous
How do I find the cpm for the old copier? \[1.5(\frac{ 72 }{ 2 } + \frac{ 72 }{ x }) = 72\]?
e.mccormick
  • e.mccormick
You just need x. Not 72/x.
anonymous
  • anonymous
Okay. \[1.5(\frac{ 72 }{ 2 } + x) = 72\]
anonymous
  • anonymous
Can you give me a hint on what to do next?
e.mccormick
  • e.mccormick
Move the 1.5 to the other side, do the dractions. They become nice numbers.
e.mccormick
  • e.mccormick
fractions... oops. I was checking the other way. It would get a very bad number.
anonymous
  • anonymous
Okay. \[\frac{ 15 }{ 10 } (\frac{ 72 }{ 2 } + x) = 72\] End up with 12.
e.mccormick
  • e.mccormick
My version of the work:\[1.5\left(\frac{ 72 }{ 2 } + x\right) = 72 \\ \implies \frac{ 72 }{ 2 } + x = \frac{72}{1.5} \\ \implies 36 + x = 48 \\ \implies x = 48-36 \\ \implies x = 12\]So 12 copies per minute. Then the time for 72 copies is \(\frac{72}{12}\)
anonymous
  • anonymous
Okay, thank you.
e.mccormick
  • e.mccormick
Yah, these and riverboat problems are all about finding what is added and what is multiplied. The true goal of word problems is trying to help you figure out how math works in real life rather than just in homework.
anonymous
  • anonymous
Okay, 6 minutes.
e.mccormick
  • e.mccormick
/cheer Yep. Really slow copier.
anonymous
  • anonymous
Haha.

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