A is 25, B's (1/4) is equal to A's (2/5), how much is B.
甲是25，乙的(1/4)等于甲的(2/5)，乙是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) / (1/4)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">25 * (8/5)</gadget>
<output>40</output>

<result>40</result>