The diameter of the wheel of the mill is 6 decimeters, and the diameter of the wheel of the motor is 2 decimeters. When the motor drives the mill, how many revolutions does the motor make for one revolution of the mill?
磨粉机的轮子直径是6分米，电动机的轮子直径是2分米，用电动机带动磨粉机时，磨粉机转动一周，电动机转多少周．
<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">6 / 6.28</gadget>
<output>0.955414</output>

<gadget id="calculator">3.14 * 0.955414</gadget>
<output>3</output>

<result>3</result>