Question 10584
Let us suppose that Alicia's Weekly Pay is  $ x

Then Jim's weekly pay becomes =   2/3 x

So now we can write a simple linear equation 

    x  +  2/3 x    =  600
    x(1 + 2/3)     =  600
     x   5/3       =  600
      x            =  600 *  3/5
      x            = 1800/5   =  360

Therefore Alicia's Weekly pay  is  $ 360
and Jim's Weekly pay is  2/3 * 360 =  $ 240

Hope the solution is clear to you.

In case you need any other help on any topic, you are welcome to contaft me.
I am available for ONLINE TUTORING at very economical rates.
My mail id is kapoorjai1@rediffmail.com.