In a ratio, if the product of two outer terms is 5, and one of the inner terms is 2.5, what is the other inner term?
在一个比例中，两个外项的积是5，其中一个内项是2.5，则另一个内项是多少．
<gadget id="calculator">5 / 2.5</gadget>
<output>2</output>

<result>2</result>