It is known that the sum of the numbers A and B is 20, the number of A is 9.05, and what is the number of B.
已知甲、乙两数的和是20，甲数是9.05，乙数是多少．
<gadget id="calculator">20 - 9.05</gadget>
<output>10.95</output>

<result>10.95</result>