The number A is 50, the number B is 30 more than the number A, and the number A is the number B (fill in the score).
甲数是50，乙数比甲数多30，甲数是乙数的多少(填写分数)．
<gadget id="calculator">50 + 30</gadget>
<output>80</output>

<gadget id="calculator">50 / 80</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>