A batch of cement is used up (5/8), and the rest is the amount used.
一批水泥，用去(5/8)，剩下的是用去的多少．
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) / (5/8)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>