The number A is (1/4) of the number B. The number of A is 20, what is the number of B
甲数是乙数的(1/4)．甲数是20，乙数是多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / (1/4)</gadget>
<output>80</output>

<result>80</result>