The number of A is 20, less than the number of B (3/5). How much is the number B greater than the number A?
甲数是20，比乙数少(3/5)．求乙数比甲数多多少？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<gadget id="calculator">50 - 20</gadget>
<output>30</output>

<result>30</result>