Given that a+b=49, then (a+8)+(b-9)=how many.
已知a+b=49，则(a+8)+(b-9)=多少．
<gadget id="calculator">49 - 9</gadget>
<output>40</output>

<gadget id="calculator">40 + 8</gadget>
<output>48</output>

<result>48</result>