A batch of parts can be completed in 4 hours, so how many hours can be completed (3/4) of this batch of parts.
做一批零件4小时可以完成，那么多少小时可以完成这批零件的(3/4)．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/4) / (1/4)</gadget>
<output>3</output>

<result>3</result>