The sum of number A and number B is 63. Moving the decimal point of number A to the right is equal to half of number B. What is number A?
甲数与乙数的和是63，甲数的小数点向右移动一位就等于乙数的一半，甲数是多少．
<gadget id="calculator">1 + 20</gadget>
<output>21</output>

<gadget id="calculator">63 / 21</gadget>
<output>3</output>

<result>3</result>