A pair of gears meshing with each other. The driving wheel has 80 teeth and turns 60 times per minute. If the driven wheel turns 200 times per minute, how many teeth should the driven wheel have? (Solve with ratio)
一对互相咬合的齿轮，主动轮有80个齿，每分钟转60圈，要使从动轮每分钟转200圈，从动轮应有多少个齿？(用比例解)
<gadget id="calculator">80 * 60</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 / 200</gadget>
<output>24</output>

<result>24</result>