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Question: In order to estimate the population of fish in a lake, a biologist catches 75 fish, marks them, releases them. Next month she catches 75 fish and finds that 5 are tagged. Use this to estimate the fish population in the lake.

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Question: A jar contains 2 red balls and 2 blue balls. If you randomly pick two balls from the jar, what's the probability they will be of opposite colors?

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Question: Conversion problem: If in Switzerland one liter of gas costs 1 Swiss Franc, one dollar is worth about 1.30 Swiss Francs, and there are about 3.8 liters in a gallon, then what is the cost of one gallon of gas in Switzerland in dollar terms?

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Question: A jogger can run down a hill five times as fast as she can run up the hill. If a round-trip jog up and down a hill takes one and one-half hours, how long does it take her to descend the hill?

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