A road is 471 meters long. Xiao Ming rolls a hoop on the road. The diameter of the hoop is 30 centimeters. How many times does the hoop need to be rolled from one end of the road to the other?
一条马路长471米，小明在马路上滚铁环，铁环直径为30厘米，从马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>