A batch of parts has been completed (1/3), and the total number (2/5) can be completed by making 16 more. How many parts are there in this batch?
一批零件，已经完成了(1/3)，再做16个就可完成总数的(2/5)，这批零件有多少个．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">16 / (1/15)</gadget>
<output>240</output>

<result>240</result>