The product of two inner terms of a ratio is 12, one outer term is (1/5), and the other outer term is how much.
一个比例的两个内项的积是12，一个外项是(1/5)，另一个外项是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">12 / (1/5)</gadget>
<output>60</output>

<result>60</result>