In a ratio, the product of two inner terms is the smallest composite number, one outer term is 5, and the other outer term is how much.
在一个比例里，两个内项的积是最小的合数，一个外项是5，另一个外项是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>