In a ratio, the product of two outer terms is 2, one of the inner terms is 7, and what is the other inner term.
在一个比例中，两个外项的积是2，其中一个内项是7，另一个内项是多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>