A's number is 350, which is 50 more than B's number. What is the sum of A's and B's numbers?
甲数是350，比乙数多50，甲、乙两数的和是多少．
<gadget id="calculator">350 - 50</gadget>
<output>300</output>

<gadget id="calculator">300 + 350</gadget>
<output>650</output>

<result>650</result>