A belt transmission device uses a large wheel to drive a small wheel to rotate. The radius of the large wheel is 0.75 meters, and the radius of the small wheel is 0.25 meters. If the large wheel makes one revolution, how many revolutions will the small wheel make?
一个皮带传动装置，用大轮带动小轮转动，大轮的半径是0.75米，小轮的半径是0.25米，如果大轮转动一周，小轮转动多少周．
<gadget id="calculator">3.14 * 0.75 * 2</gadget>
<output>4.71</output>

<gadget id="calculator">3.14 * 0.25 * 2</gadget>
<output>1.57</output>

<gadget id="calculator">4.71 / 1.57</gadget>
<output>3</output>

<result>3</result>