In a ratio, the product of two outer terms is the smallest prime number, one inner term is (2/3), and the other inner term is what.
在一个比例里，两个外项的积是最小的质数，一个内项是(2/3)，另一个内项是多少．
<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>