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anonymous
 one year ago
Working together, 7 identical pumps can empty a pool in 6 hours. How many hours will it take 4 pumps to empty the same pool?
anonymous
 one year ago
Working together, 7 identical pumps can empty a pool in 6 hours. How many hours will it take 4 pumps to empty the same pool?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@satellite73 can we take this one slow too?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sure unit rate again

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So 7/6 will be how much 1 pump can empty a pool

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0lets start with how much 7 pumps do per hour

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0isn't that what 7/6 finds?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.07 pumps take 6 hours, so 7 pumps do \(\frac{1}{6}\) per hour

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how much does one pump do? don't multiply by 7, divide (like last time)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok good now each pump does \(\frac{1}{42}\) per hour, how much does 4 pumps do (this time multiply)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0or you can reduce to get \(\frac{2}{21}\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmmm did we do something wrong? my answer say 42/4 = 10 1/2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you want to see how long it takes to do one job,

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0solve \[\frac{2}{21}T=1\] making \[T=\frac{21}{2}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no we didn't do anything wrong, we just were not done yet we got the unit rate at \(\frac{2}{21}\) but we need the total time

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0they do 2/21 of a job per hour, takes 21/2 hours to do one job

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0there may have been a quicker way to do this, but it is good to know how to get the unit rate so you can do all kinds of problems with it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so do we now multiply by 4?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohhh okay this is a different method i got it now

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0we got the unit rate of \(\frac{1}{42}\) that was pump per hour

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0then we multiplied by 4 to get the rate for 4 pumps and got \(\frac{2}{21}\)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0then we solved \[\frac{2}{21}T=1\] the 1 being one pool

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0if it was two pools it would have been \[\frac{2}{21}=2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0hmmm okay i think i understand now i'll review the last 2 problems we did a couple of times

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok if you get stuck let me know

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0we can make one up and do it now if you like

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes yes that would help even more

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0see that they are not that hard and are largely the same

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you want me to make it up, or you want to?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0k they numbers might not come out real nice if i make it up off the top of my head, but no matter

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0it takes 5 hours for 8 men to build one wall how long would it take 10 men to build 2 walls (sexist i now but whatever)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0first find the unit rate for one man let me know when you think you have it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01/8 divided by 5 = 1/40

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0now the rate for 10 men

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01/40 * 10 = 10/40 = 1/4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok good now how long to build 2 walls

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0aw damn we were doing so well

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0not going to take half an hour !

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0now we need to go slow either we solve \[\frac{1}{4}T=2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohhhhhh yeaaaa thats right so 8

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok i'll keep practicing this

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0almost got it 100% thanks satellite

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok, i think it is getting easier though right? first part went quick
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