1. Which of the following are the best definitions of the decision variables? No
ID: 350674 • Letter: 1
Question
1. Which of the following are the best definitions of the decision variables?
None of the above.
2. The cost of crashing activity A by one week is
A)1400
800
600
300
none of the above
3. The appropriate objective function should be
a)
None of the above.
4. Which of the following represents the constraint(s) to model the fact that activities A and C are immediate predecessors of activity D?
None of the above.
A)– start time of activity , – time to be crashed, i.e., saved, for activity , for .
B)– finish time of activity , – time to be crashed, i.e., saved, for activity , for .
C)– start time of activity , – finish time of activity , for .
D)– start time of activity , – time finally used by activity , for .
E)None of the above.
A community neighborhood association decided to add a swimming pool to the community activity center. The project is divided into the activities listed in the following table. The activity times and costs, both normal and crashed, are given. To finish the project before the summer season starts, the neighborhood has to make time and cost trade offs. If the project needs to be finished in 20 weeks, you are required to formulate a linear programming model to decide about how much to crash for each activity Immediate Time (weeks Norm Crashed Norma Crashed Cost (S Activity Predecessor s 1400 3000 2500 1600 1200 300 8200 800 2100 2100 B, C To answer the following questions, you may want to use the last column of the following table to compute the cost of crashing an activity by one week. Time (wecks Activity Immediate Predecessoris) Normal Crashed Norma Cost/Week Crashed 1400 800 2500 2200 1600 2100 1200 1300 A, C B, C 00 2100Explanation / Answer
1) C - start and finish time can be further utilised in objective function for multiplying crashing cost.
2) A From the table it isw clear that one week crashing cost is 1400
3) Min equation for crashing cost
4) equation for A and C which represents completion before proceding to equation D.
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