The latter term of the ratio is 15, the ratio is (1/5), what is the former term
比的后项是15，比值是(1/5)，前项是多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 * (1/5)</gadget>
<output>3</output>

<result>3</result>