Master Li processes 75 parts in 3 hours. According to this calculation, how many hours will it take to process another 225 parts? (proportional solution)
李师傅3小时加工零件75个，照这样计算，再加工225个零件，共需多少小时？(比例解)
<gadget id="calculator">225 + 75</gadget>
<output>300</output>

<gadget id="calculator">300 * 3</gadget>
<output>900</output>

<gadget id="calculator">900 / 75</gadget>
<output>12</output>

<result>12</result>