2.5 times of the number A is equal to 40% of the number B. Given that the number A is 20, what is the number B?
甲数的2.5倍与乙数的40%相等，已知甲数是20，乙数是多少．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2.5 / (2/5)</gadget>
<output>6.25</output>

<gadget id="calculator">20 * 6.25</gadget>
<output>125</output>

<result>125</result>