You can
put this solution on YOUR website! .
Let x be the Joe' salary. Then
2x is the Pete' salary
(x-200) is the Mark' salary
x is the Andy' salary
The total salary equation is
x + 2x + (x-200) + x = 1825.
You do the rest.
Please do not place more than one problem per post.
It is PROHIBITED by the rules of this forum.