Two pulleys connected together, the diameter of the big pulley is 4.5 decimeters, the diameter of the small pulley is 3 decimeters, the big pulley rotates 10 times, how many turns does the small pulley make?
两个连在一起的皮带轮，大轮直径是4.5分米，小轮直径是3分米，大轮转10圈，小轮转多少圈
<gadget id="calculator">3.14 * 4.5 * 10</gadget>
<output>141.3</output>

<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<gadget id="calculator">141.3 / 9.42</gadget>
<output>15</output>

<result>15</result>