In order to ease the traffic congestion, the road width of the highway was increased from 12m to 18m, how much was the width widened?
为了缓解交通拥挤的状况，公路的路宽由原来的12m增加到18m，拓宽了百分之几？
<gadget id="calculator">18 - 12</gadget>
<output>6</output>

<gadget id="calculator">6 / 12</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>