SOLUTION: Here is the problem: If it takes you 45 minutes to clean the fish tank and it takes your sister 30 minutes. How long does it take if you work together? Is it 45X+30x=1? H

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Question 498851: Here is the problem:
If it takes you 45 minutes to clean the fish tank and it takes your sister 30 minutes. How long does it take if you work together?
Is it 45X+30x=1?
Help?
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Er...not quite!
Try:
%281%2F45%29x%2B%281%2F30%29x+=+1 Simplify and solve for x.
%282%2F90%29x%2B%283%2F90%29x+=+1
%285%2F90%29x+=+1 Multiply both sides by 90.
5x+=+90 Divide both sides by 5.
x+=+18minutes.