In a ratio, the product of the two outer terms is 18, one of the inner terms is 6, and what is the other inner term.
在一个比例中，两个外项的积是18，其中一个内项是6，另一个内项是多少．
<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<result>3</result>