The former term of the ratio is 0.4, and the ratio is (2/5), what is the latter term of the ratio.
比的前项是0.4，比值是(2/5)，则比的后项是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.4 / (2/5)</gadget>
<output>1</output>

<result>1</result>