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You can clean the gym floor for 50 minutes:

You can clean the gym floor in 50 minutes less than bob. If you work together, you can do it in 45 miutes. How long does it take you to clean the floor by yourself?
 
Id like to see how this problem is worked out as well.
All help is appreciated!
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1 Answer

x  is Bob
(x-50) is you
 
x+(x-50)=45
2x-50=45
2x=95
x=47.5 minutes