The number of male workers in a workshop is 4/5 of the number of female workers, and the number of male workers is the number of the whole factory.
某车间男工人数是女工人数的(4/5)，男工是全厂人数的多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(4/5) / (9/5)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>