For a 16-meter-long water pipe, increase (1/2) and then decrease (1/2), what is the result in meters?
16米长的水管，增加它的(1/2)后，再减少(1/2)，结果是多少米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

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

<gadget id="calculator">16 * (3/2) * (1/2)</gadget>
<output>12</output>

<result>12</result>