Two pulleys connected together, one of the wheels has a diameter of 6 decimeters, when the other wheel makes one revolution, it will make 3 revolutions, what is the diameter of the other wheel in decimeters?
两个连在一起的皮带轮，其中一个轮子的直径是6分米，当另一个轮子转一周时，它要转3周，另一个轮子的直径是多少分米．
<gadget id="calculator">3.14 * 6 * 3</gadget>
<output>56.52</output>

<gadget id="calculator">56.52 / 3.14</gadget>
<output>18</output>

<result>18</result>