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Biologists tagged 180 fish in a lake on January 1. On February​ 1, they returned and collected a random sample of 4545 ​fish, 1515 of which had been previously tagged. On the basis of this​ experiment, approximately how many fish does the lake​ have?

Suppose that Hortense and Mort can clean their entire house in 7 ​hours, while their​ toddler, Mimi, just by being​ around, can completely mess it up in only 5 hours. If Hortense and Mort clean house while Mimi is at her​ grandmother's, and then start cle...