4/(5/3)/(9/20).
4/(5/3)/(9/20)．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">4 / (5/3) / (9/20)</gadget>
<output>16/3 = around 5.333333</output>

<result>16/3 = around 5.333333</result>