The number A is 25, and the number B is 5 less than twice the number A, what is the number B?
甲数是25，乙数比甲数的2倍少5，乙数是多少．
<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">50 - 5</gadget>
<output>45</output>

<result>45</result>