In a ratio, the product of two outer terms is 1, one of the inner terms is 4, and what is the other inner term.
在一个比例中，两个外项的积是1，其中一个内项是4，另一个内项是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>