When a is (3/2) of b and (5/2) of c, c is how much of b.
当a是b的(3/2)、是c的(5/2)时，c是b的多少．
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">1 / (3/2)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (5/2) / (2/3)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>