The diameter of one of the two connected pulleys is 5 decimeters. When the other wheel makes one revolution, it will make 4 revolutions. What is the diameter of the other wheel?
两个连在一起的皮带轮其中一个轮子的直径是5分米，另一个轮子转动一周时，它要转动4周，另一个轮子的直径是多少分米？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 / 1</gadget>
<output>20</output>

<result>20</result>