A road is 47.1 meters long. Xiao Ming rolls a hoop on the road. The diameter of the hoop is 30 cm. He rolls it from one end of the road to the other. How many times does the hoop roll.
一条公路长47.1米，小明在公路上滚铁环，铁环的直径是30厘米，从公路的一端滚到另一端．铁环滚动多少周．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3.14 * (3/10)</gadget>
<output>0.942</output>

<gadget id="calculator">47.1 / 0.942</gadget>
<output>50</output>

<result>50</result>