The product of two inner terms in a ratio is 0.8, if one outer term in the ratio is the smallest composite number, what is the other outer term.
一个比例中的两个内项的积是0.8，若比例中一个外项是最小的合数，则另一个外项是多少．
<gadget id="calculator">0.8 / 4</gadget>
<output>0.2</output>

<result>0.2</result>