A road is 47.1 meters long. Xiao Ming rolls an iron hoop on the road. The diameter of the iron ring is 30 cm. When rolling from one end of the road to the other, how many turns does the hoop have to make?
一条甬路长47.1米，小明在甬路上滚铁环，铁环直径为30厘米，从甬路的一端滚到另一端，铁环要转多少圈？
<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>