20 hoursOriginally Posted byeah1010

I like to do these problems like this: In one hour Dan does of the carpet and Mike does hours. Thus, together in exactly one hour they do of the carpet. Thus, make the propertion if in 1 hour they do of the carpet, then how much for the full carpet. In proportion terms,

Cross multiply,

Solve,

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I developed a formula:

If it takes a person hours to do a job and it takes another hours to do the job then together it takes them

You can use this to solve your problem.