The number A is 250, the number B is 50 less than the number A, and the number B is the number A
甲数是250，乙数比甲数少50，乙数是甲数的多少
<gadget id="calculator">250 - 50</gadget>
<output>200</output>

<gadget id="calculator">200 / 250</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(4/5) * 1</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>