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the children's play area at the community pool holds a total of 3,185 gallons of water.
it takes 2.5 hours to fill the pool with 1.625 gallons of water.
how many gallons of water does the pool have after 1 hour?

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.