In a proportional formula, the product of the two outer terms is the smallest prime number, one of the inner terms is 3, and what is the other inner term.
在一个比例式中，两上外项的积是最小的质数，其中一个内项是3，另一个内项是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>