The difference between the numbers A and B is 80, the number B is 20, and the number B is the number A.
甲、乙两数的差是80，乙数是20，乙数是甲数的多少．
<gadget id="calculator">20 + 80</gadget>
<output>100</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>