Master Liu processes a batch of parts. If 12 parts are processed every day, it will take 50 days to complete. If 3 more parts are processed every day, how many days will it take to complete?
刘师傅加工一批零件，如果每天加工12个，要50天完成，如果每天多加工3个，需要多少天完成？
<gadget id="calculator">12 + 3</gadget>
<output>15</output>

<gadget id="calculator">50 / 15</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">12 * (10/3)</gadget>
<output>40</output>

<result>40</result>