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  • Math problem.

    A hot-air baloon containing 3 men was caught in a hurricane and deposited on a deserted island. There are two sources of food on the island: fish and coconuts. After some experimentation, the men have found that, on average, one man can catch 4 ounces of fish each hour or he can gather 10 ounces of coconut meat in an hour. They know that one ounce of fish provides 14 g of protein, 80 calories, and 100mg of vitamin A. An ounce of coconut meat provides 2 g of protein, 200 calories, and 50mg of vitamin A. The minimum daily requirements for each man are: 42 g of protein, 2,000 calories, and 600 mg of vitamin A. The men wish to minimize the amount of time needed to gather food so they can work on finding a way to get off the island.


    Let f = the number of hours spent catching and preparing fish and c = the number of hours gathering coconuts and preparing coconut meat. The castaway's object is to minimize 1/4 f + 1/10 c.


    1. Write a set of constraints to fit the problem as described above.

    2. How much time should the castaways spend on each activity to minimize their objective function. Show all of your work to justify your solution.

    3.After one month, the castaways have gathered all of the coconuts close to their camp. They now must walk far enough away from their camp to gather coconuts that their optimal behavior is to only catch fish to minimize their objective. What is the maximum number of ounces of coconut meat they can now gather in one hour?


    And for extra credit. Graph the castaways constraints to show the region of feasible solutions to the linear programming problem.

    Good luck.
    A man who desires nothing is invincible.

  • #2
    me too, do your own freaking work

    Comment


    • #3
      I got an A in a math class in college by posting one question on the net....ahh yea...
      _-Tri/p_

      Comment


      • #4
        Give me a minute

        That's multivariable calc, we haven't learned that, so i can only help you up to a point

        Directly substitute in the statistics of the nutrition facts into the equation for each man's gathering rate.
        now it'd be like "each man can gather 8 grams of protein, etc./hour, or 32 g or protein, etc./hour"

        You have three equations, two about rate of gathering nutrition, and one main one.

        from this point on it's TOTAL guesswork:

        Substitute in each nutrition rate equation into the main equation and take the derivative ( if you have to substitute a few times to get the same independent variable, do so..). set the derivative = 0. the smallest value (that can exist within the domain) is the minimum.
        Last edited by Aquatiq; 02-12-2004, 12:26 AM.

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        • #5
          From the three words I read it sounded sorta like a programming type thing for some reason...meh
          _-Tri/p_

          Comment


          • #6
            Originally posted by SnallTrippin
            From the three words I read it sounded sorta like a programming type thing for some reason...meh
            A hot-air balloon ?

            Comment


            • #7
              The answer is....


              2
              Live, love, laugh, and drink beer :wub:

              Comment


              • #8
                I never knew coconuts had meat o.o....

                Comment


                • #9
                  i hate maths.


                  yes, that's right maths.

                  Comment


                  • #10
                    Yepper...coconut meat is the yummy yummy stuff inside...mm...
                    _-Tri/p_

                    Comment


                    • #11
                      I'm gonna show this one to my genius algebra teacher... and if he can't get it then there's a problem. (No pun intended)
                      Pandagirl!

                      (ph)>12 is just right

                      In the most dangerous game...warping will only prolong your defeat. ?go warpwars -Chao <ER>
                      1:Chao <ER>> what the FUCK?
                      1:Chao <ER>> I just adverted and no one came
                      1:Chao <ER>> at all
                      1:Mantra-Slider> chao
                      1:Mantra-Slider> you are in the wrong arena
                      Panda <ZH>> ?find chao <ER>
                      Chao <ER> - hero

                      Comment


                      • #12
                        So, no one else attempted it?

                        Btw don't embarass your algebra teacher - he/she might not know it..

                        Comment


                        • #13
                          Yea be he claims like five times a day that he knows everything so this is too good to pass up. He might just end up writing "No one cares" on the paper though.
                          Pandagirl!

                          (ph)>12 is just right

                          In the most dangerous game...warping will only prolong your defeat. ?go warpwars -Chao <ER>
                          1:Chao <ER>> what the FUCK?
                          1:Chao <ER>> I just adverted and no one came
                          1:Chao <ER>> at all
                          1:Mantra-Slider> chao
                          1:Mantra-Slider> you are in the wrong arena
                          Panda <ZH>> ?find chao <ER>
                          Chao <ER> - hero

                          Comment

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