There is a three-digit number A, and the number B is obtained by adding a decimal point in front of one of its digits. If AB=478.8, then A=how much.
有一个三位数A，在它的某位数字的前面添上小数点后得数B，若A-B=478.8，则A=多少．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">478.8 / (9/10)</gadget>
<output>532</output>

<result>532</result>