The sum of A and B is 30 greater than A and 20 greater than B. What is the sum of A and B?
甲、乙两数之和比甲数大30，比乙数大20，甲、乙两数的和是多少．
<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<result>50</result>