To process a batch of parts, A can complete it alone in 30 hours; B can process 20 parts per hour. After the two work together, A has processed (1/5) more of the total than B. How many parts are there in this batch?
加工一批零件，甲单独做30小时完成；乙每小时加工20个．两人合做完成后，甲比乙多加工了总数的(1/5)，这批零件共有多少个？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(6/5) / 2 / (1/30) / (2/5)</gadget>
<output>45</output>

<gadget id="calculator">20 * 45</gadget>
<output>900</output>

<result>900</result>