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e.mccormickBest ResponseYou've already chosen the best response.1
How far did you get with this?
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Hold on a second please, I'm writing.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
Kk. Cause I do have a path to the answer...
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
\[\frac{ 72 }{ 2 } + \frac{ 72 }{ x } = \frac{ 72 }{ 1.5 }?\]
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
hmm... I can see where you got the 72/2 and 72/1.5.... but the 72/x makes no sense to me.
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Sorry, I was looking at the example in my book, and tried to model it like it.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
\(c_1 cpm=\frac{72}{2}\) and \(c_2 cpm=?\) Where cpm is Copies Per Minute \(1.5(c_1 cpm+c_2 cpm)=72\)
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
Once you know the CPM for the old copier, you can find out how long it takes to make 72 copies.
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Sorry, I was writing this down.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
Your method might actually do that in one shot, don't know. You could run it both ways and see.
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
How do I find the cpm for the old copier? \[1.5(\frac{ 72 }{ 2 } + \frac{ 72 }{ x }) = 72\]?
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
You just need x. Not 72/x.
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Okay. \[1.5(\frac{ 72 }{ 2 } + x) = 72\]
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Can you give me a hint on what to do next?
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
Move the 1.5 to the other side, do the dractions. They become nice numbers.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
fractions... oops. I was checking the other way. It would get a very bad number.
 11 months ago

ValentinaTBest ResponseYou've already chosen the best response.0
Okay. \[\frac{ 15 }{ 10 } (\frac{ 72 }{ 2 } + x) = 72\] End up with 12.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
My version of the work:\[1.5\left(\frac{ 72 }{ 2 } + x\right) = 72 \\ \implies \frac{ 72 }{ 2 } + x = \frac{72}{1.5} \\ \implies 36 + x = 48 \\ \implies x = 4836 \\ \implies x = 12\]So 12 copies per minute. Then the time for 72 copies is \(\frac{72}{12}\)
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
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.
 11 months ago

e.mccormickBest ResponseYou've already chosen the best response.1
/cheer Yep. Really slow copier.
 11 months ago
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