Jay has three times as much money as sue. If sue's money is represented by variable m, then Jay's money would be shown by 3m. You know that their money together is 252 dollars, so m + 3m = 252. Now, you can solve for m.
m + 3m = 252 Combine like terms
4m = 252 Divide
m = 63
3 x 63 = 189
So, Sue has $63 and Jay has $189.