(1/4)/(((3/5)-(1/4)))*(2/5).
(1/4)/(((3/5)-(1/4)))*(2/5)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - (1/4)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(1/4) / (7/20)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/7) * (2/5)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>