The number ratio of large and small gears is 8:5, the small gear has 30 teeth, how many teeth does the large gear have.
大小齿轮的个数比是8：5，小齿轮有30个齿，大齿轮有多少个齿．
<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 * 8</gadget>
<output>48</output>

<result>48</result>