The radius of a hoop is 0.3 meters, how many circles must the hoop roll to make it roll 942 meters?
一个铁环的半径是0.3米，要使铁环滚动942米，至少需要滚动多少圈？
<gadget id="calculator">2 * 3.14 * 0.3</gadget>
<output>1.884</output>

<gadget id="calculator">942 / 1.884</gadget>
<output>500</output>

<result>500</result>