The difference between the numbers A and B is 450. If the 0 at the end of the number A is removed, it will be equal to the number B. Find the sum of the two numbers A and B.
甲、乙两数相差450，如果把甲数末尾的0去掉，就和乙数相等，求甲、乙两数的和．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">450 / 9</gadget>
<output>50</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">50 + 500</gadget>
<output>550</output>

<result>550</result>