The sum of the two numbers A and B is 45. After the decimal point of A number is moved to the right, it is exactly twice the number B. What is the original number of A?
甲乙两数的和是45，甲数的小数点向右移动一位后，恰好是乙数的2倍．甲数原来是多少．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">45 / 6</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>