To solve this question, first find the ratio of investment as shown below:
[tex]1000\colon1500\colon3500=2\colon3\colon7[/tex]The ratio is obtained by dividing by 500.
Now let the common multiple be x.
[tex]\begin{gathered} 2x+3x+7x=1500 \\ 12x=1500 \\ x=\frac{1500}{12} \\ x=125 \end{gathered}[/tex]So Aren receives 2x=$250
Warner receives 3x=$375
Brown receives 7x=$875