In a ratio, the product of two outer terms is the smallest prime number, one of which is (5/7), and what is the other inner term.
在一个比例中，两个外项的积是最小的质数，其中一个内项是(5/7)，另一个内项是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / (5/7)</gadget>
<output>14/5 = around 2.8</output>

<result>14/5 = around 2.8</result>