In the ratio, the product of two inner terms is the smallest prime number, one of which is (2/3), and what is the other outer term.
在比例里两个内项的积是最小的质数，其中一个外项是(2/3)，另一个外项是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2 / (2/3)</gadget>
<output>3</output>

<result>3</result>