The number of A is less than the number of B (7/20), and the number of B is about how much more than the number of A.
甲数比乙数少(7/20)，乙数约比甲数多多少．
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (7/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(7/20) / (13/20)</gadget>
<output>7/13 = around 0.538462</output>

<result>7/13 = around 0.538462</result>