The number A is 20, which is 5 times less than the number B, what is the number B
甲数是20，比乙数的5倍少5，则乙数是多少
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<result>5</result>