- 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.

- schrodinger

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- amistre64

how much of the pool is filled in 1 minute by each of them seperately?

- amistre64

Lp = 1/45 parts per minute
Sp = 1/110 parts per minute
right?

- 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

155 parts out of 4950 are filled in 1 minute by both pipes working together

- amistre64

31/990 might be an easier fraction to play with...

- anonymous

so if the question was in hours would i just find how much of "x" is completed in one hour?

- amistre64

Yep.... that would be it...then figure out how long it takes to do the entire "job"

- amistre64

31 minutes and 29/31 left to fill
------
31| 990
93
----
60
31
----
29

- amistre64

id say 32 minutes at most :)

- anonymous

you lost me

- anonymous

i got how we had 155/4950

- anonymous

then we simplified?

- 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

31?

- amistre64

155 + 155 + 155 + 155....till you get near 4950

- anonymous

OHHH

- anonymous

ok i get it THANKS

- amistre64

155
31
-----
155
365
-----
4805 right?

- anonymous

oh
32

- amistre64

4950
-4805
------
145 more parts to fill out of 155 per minute :)

- amistre64

which is close to 1 minute so round to 32 :)

- 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

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

ok that makes sense

- anonymous

thanks :)

- anonymous

who u talkin 2...

- anonymous

not you

- 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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