In a ratio, the product of two inner terms is the smallest composite number, one outer term is 0.4, and the other outer term is what.
在一个比例中，两个内项的积是最小的合数，一个外项是0.4，另一个外项是多少．
<gadget id="calculator">4 / 0.4</gadget>
<output>10</output>

<result>10</result>