Produce a batch of parts, complete (3/8) of the total in the morning, complete the rest (2/5) in the afternoon, and complete the total in the afternoon.
生产一批零件，上午完成总数的(3/8)，下午完成余下的(2/5)，下午完成总数的多少．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

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

<gadget id="calculator">(5/8) * (2/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>