((x)/15)=(5/6).
((x)/15)=(5/6)．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(5/6) / (1/15)</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>