In a ratio, the product of two outer terms is the smallest prime number, one of which is 5, and what is the other inner term.
在一个比例里，两个外项的积是最小的质数，其中一个内项是5，另一个内项是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>