For a batch of parts, the ratio of processed to unprocessed is 2:3, and another 40 parts are made. At this time, the ratio of completed to unfinished is 3:2. Find the total.
一批零件，已加工与未加工的比是2：3，又做了四十个，这时已完成与未完成的比是3：2，求总数．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / (1/5)</gadget>
<output>200</output>

<result>200</result>