(1/4) of the number A is equal to 20% of the number B, the number B is 1000, what is the number A?
甲数的(1/4)等于乙数的20%，乙数是1000，甲数是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/5) / (1/4)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_000 * (4/5)</gadget>
<output>800</output>

<result>800</result>