A batch of parts, if 6 parts are processed every day, can be completed in 20 days, but now it needs to be finished 8 days earlier, how much more should be processed every day than before? (Solve with ratio)
一批零件，如果每天加工6个，20天可以完成，现在要提前8天干完，每天要比原来多加工几个？(用比例解)
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">120 - 120</gadget>
<output>0</output>

<gadget id="calculator">48 + 0</gadget>
<output>48</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<result>4</result>