Question 1152295
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Let x = Mary' share.


Then the Alice' share is (2x-1000) dollars,  

and Bob' share is (x+2000).


The equation for the total then is


    x + (2x-1000) + (x+200) = 25000  dollars.


Simplify and solve for x


    4x + 1000 = 25000

    4x = 25000 - 1000 = 24000

     x                = 24000/4 = 6000  dollars.


<U>ANSWER</U>.  Mary' share is $6000;  Alice' share is 2*6000-1000 = 11000 dollars;  Bob' share is  6000+2000 = 8000 dollars.


<U>CHECK</U>.  6000 + 11000 + 8000 = 25000.   ! Precisely correct !
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Solved.