The number A is 20, which is 100% more than the number B, what is the number B?
甲数是20，比乙数多100%，乙数是多少．
<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>