The gear ratio of the large and small gears is 4:3, the large gear has 48 teeth, how many teeth does the small gear have.
大小两个齿轮的齿数比是4：3，大齿轮有48齿，小齿轮有多少齿．
<gadget id="calculator">48 * 3</gadget>
<output>144</output>

<gadget id="calculator">144 / 4</gadget>
<output>36</output>

<result>36</result>