(4/5) of number A is equal to 20% of number B. Number B is 240. What is number A?
甲数的(4/5)和乙数的20%相等，乙数是240，甲数是多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (4/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">240 * (1/4)</gadget>
<output>60</output>

<result>60</result>