A's number is 8.7, which is 0.29 more than B's number. Find the sum of A and B's numbers.
甲数是8.7，比乙数多0.29，求甲、乙两数的和．
<gadget id="calculator">8.7 - 0.29</gadget>
<output>8.41</output>

<gadget id="calculator">8.41 + 8.7</gadget>
<output>17.11</output>

<result>17.11</result>