Two pulleys connected by a belt, the radius of the big pulley is 6 decimeters, the radius of the small pulley is 4 decimeters, the big pulley rotates 300 revolutions per minute, how many revolutions per minute does the small pulley make?
用皮带连接的两个皮带轮，大轮半径为6分米，小轮半径为4分米，大轮每分钟转300转，小轮每分钟转多少转？
<gadget id="calculator">2 * 3.14 * 6 * 300</gadget>
<output>11_304</output>

<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<gadget id="calculator">11_304 / 25.12</gadget>
<output>450</output>

<result>450</result>