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Posted by **Anonymous** on Thursday, June 28, 2012 at 5:10pm.

- Math -
**Ms. Sue**, Thursday, June 28, 2012 at 5:14pmSee

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- Math -
**Reiny**, Thursday, June 28, 2012 at 5:18pmJim's rate = pool/30

Sue's rate = pool/45

Tony'rate = pool/90

combined rate = pool/30 + pool/45 + pool/90

= (3pool + 2pool + pool)/90 = 6pool/90

= 2pool/30

time to fill pool with combined rate

= pool/(2pool/30)

= 1/(2/30)

= 15

- Math -
**Anonymous**, Thursday, June 28, 2012 at 6:00pmIm still not sure how you are geting the (3pool+2pool+pool) where are those numbers coming from?

- Math -
**Ms. Sue**, Thursday, June 28, 2012 at 6:03pmJim can fill 3 pools in 90 minutes; Sue fills 2 pools in 90 minutes . . .

- Math -
**Anonymous**, Thursday, June 28, 2012 at 6:05pmoh wow thank you so much i totally understand now

- Math -
**Ms. Sue**, Thursday, June 28, 2012 at 6:11pmYou're very welcome.

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