Two sprockets of a bicycle are connected together. The diameter of one sprocket is 1 decimeter. When the other sprocket rotates once, it makes 4 revolutions. What is the diameter of the other sprocket?
自行车两个链轮连在一起，其中一个链轮的直径是1分米，当另一个链轮转动一周时，它转动4圈，另一个链轮的直径是多少分米．
<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>