A batch of 100 tons of goods, 4 hours to transport away its (1/2). How many hours will the rest be shipped?
一批货物100吨，4小时运走了它的(1/2)．剩下的要几小时运完？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 4</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/2) / (1/8)</gadget>
<output>4</output>

<result>4</result>