A road was repaired in a week, how much was the road repaired in 3 days
一条公路，一星期修完，3天修了这条公路的多少
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">3 * (1/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>