Xiaogang rides a unicycle on a road with a length of 31.4m. One type of tire has a diameter of 40cm. How many revolutions does the wheel need to complete the journey?
小刚骑独轮车走过长为31.4m的路，一种轮胎直径是40cm，走完全程车轮需转多少周？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * (2/5)</gadget>
<output>1.256</output>

<gadget id="calculator">31.4 / 1.256</gadget>
<output>25</output>

<result>25</result>