To make a batch of parts, Master Wang will make more parts than Master Li (1/10), and Master Li will make 40 fewer parts than Master Wang. How many parts are there in total?
做一批零件，做完时王师傅比李师傅多做(1/10)，李师傅比王师傅少做40个．这批零件一共有多少个？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">40 / (1/10)</gadget>
<output>400</output>

<gadget id="calculator">400 + 40 + 400</gadget>
<output>840</output>

<result>840</result>