The three groups process a batch of garments at the same time. It is known that the ratio of garment sets processed by Group A to Group B is 8:9, the ratio of garment sets processed by Group B to Group C is 3:5, and Group C processed 105 more sets than Group A. How many sets did Group C process?
三个组同时加工一批服装，已知甲组与乙组加工服装套数比是8：9，乙组与丙组加工服装套数比是3：5，丙组比甲组多加工了105套，丙组加工了多少套？
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">105 / 7</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<result>225</result>