Two connected pulleys, the diameter of the big pulley is 3 decimeters, the diameter of the small pulley is 1 decimeter and 2 centimeters, how many revolutions does the small pulley take to make one revolution of the big pulley.
两个连在一起的皮带轮，大轮直径是3分米，小轮直径是1分米2厘米，大轮转1周，小轮要转多少周．
<gadget id="calculator">3.14 * 3</gadget>
<output>9.42</output>

<gadget id="calculator">12 / 10</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">3.14 * (6/5)</gadget>
<output>3.768</output>

<gadget id="calculator">9.42 / 3.768</gadget>
<output>2.5</output>

<result>2.5</result>