It is known that (1/4) of the number A is equal to (1/5) of the number B. If the number A is 40, what is the number B?
已知甲数的(1/4)等于乙数的(1/5)，如果甲数是40，那么乙数是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) / (1/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">40 * (5/4)</gadget>
<output>50</output>

<result>50</result>