SOLUTION: Three electricians are wiring your 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 her

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Question 1061828: Three electricians are wiring your 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?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
in one day, E1 will do 1/11; E2 will do 1/5 and E3 will do 1/9
It will take x days for the three of them to do the whole house
x/11+x/5+x/9=1
multiply by a common denominator of 495
45x+99x+55x=495
199x=495
x=2.49 days
2.49/11=0.226
2.49/5=0.498
2.49/9=0.277
That adds to 1.001