A road is repaired in a week, how much is the road repaired in 4 days
一条公路一星期修完，4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">4 * (1/7)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>