anonymous
  • anonymous
It takes a large pipe 45 minutes to fill a pool. A smaller pipe can fill the pool in 110 minutes. Working together, how long does it take (to the nearest minute) for both pipes to fill the pool.
Mathematics
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
how much of the pool is filled in 1 minute by each of them seperately?
amistre64
  • amistre64
Lp = 1/45 parts per minute Sp = 1/110 parts per minute right?
amistre64
  • amistre64
Lp + Sp working together fill the what part in one minute? 1/45 + 1/110 = 155/4950 is my easy math way :)

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More answers

amistre64
  • amistre64
155 parts out of 4950 are filled in 1 minute by both pipes working together
amistre64
  • amistre64
31/990 might be an easier fraction to play with...
anonymous
  • anonymous
so if the question was in hours would i just find how much of "x" is completed in one hour?
amistre64
  • amistre64
Yep.... that would be it...then figure out how long it takes to do the entire "job"
amistre64
  • amistre64
31 minutes and 29/31 left to fill ------ 31| 990 93 ---- 60 31 ---- 29
amistre64
  • amistre64
id say 32 minutes at most :)
anonymous
  • anonymous
you lost me
anonymous
  • anonymous
i got how we had 155/4950
anonymous
  • anonymous
then we simplified?
amistre64
  • amistre64
if I did the addition right: we get 155 parts out of 4950 that are being doen in one minute 155 divides 4950 how many time?
anonymous
  • anonymous
31?
amistre64
  • amistre64
155 + 155 + 155 + 155....till you get near 4950
anonymous
  • anonymous
OHHH
anonymous
  • anonymous
ok i get it THANKS
amistre64
  • amistre64
155 31 ----- 155 365 ----- 4805 right?
anonymous
  • anonymous
oh 32
amistre64
  • amistre64
4950 -4805 ------ 145 more parts to fill out of 155 per minute :)
amistre64
  • amistre64
which is close to 1 minute so round to 32 :)
anonymous
  • anonymous
instead of confusing yourself just think about it as if you were filling up your pool asnd you really wanted to go swim do you decide to use both of them so it can go faster one of you freinds asks you about what time will it be done and and you give her an amout of min. whatr would you tell him/her?
amistre64
  • amistre64
that last part always used to get me... until I realized the the "155" took one full minute and we only needed "145" of those: 145 --- is the reminder of the minute which is close enough to 1 right :) 155
anonymous
  • anonymous
ok that makes sense
anonymous
  • anonymous
thanks :)
anonymous
  • anonymous
who u talkin 2...
anonymous
  • anonymous
not you
anonymous
  • anonymous
i no but i want to know which person is right i am trying to figure it our myself and btw dnt be ruse witrh me u dnt know who u tlkkin to...

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