It takes 10 days for A and B to make a batch of parts. If A, B, and C work together in 8 days, how many days will it take for C to make this batch of parts alone?
一批零件，A、B两人合做要10天完成，如果A、B、C三人合做只要8天完成，C单独做这批零件要多少天？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

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

<result>40</result>