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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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1125 = 1/5 of fist were caught: 75 * 15 
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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2/3: first ball can be either color, second ball must be opposite color: of the three balls remaining, you can choose any two of them) 
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 roundtrip jog up and down a hill takes one and onehalf hours, how long does it take her to descend the hill?
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