Three electricians are wiring my new home. Electrician 1 by himself will need 11 days to do the job. Electrician 2 by himself will need 5 days to do the job. Electrician 3 by herself will need 9 days to do the job. If all three electricians work on the job, how long will the job take to complete?

a/ Develop an Input – Processing – Output model for the given problem

b/ Build an influence diagram that represents the processing logic of the given problem

c/ Use the Goal Seek technique in Excel to solve the problem. An accurate specification of the three parameters in the Goal Seek Window is required.

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