The gear ratio of the large and small gears is 8:5, the small gear has 40 teeth, how many teeth does the large gear have.
大小齿轮的齿轮个数比是8：5，小齿轮有40个齿，大齿轮有多少个齿．
<gadget id="calculator">8 / 5</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(8/5) * 40</gadget>
<output>64</output>

<result>64</result>