(1/12)=(1/(a))+(1/(b)), the difference between a and b is 10, what is the sum of a+b?
(1/12)=(1/(a))+(1/(b))，a与b相差10，则a+b的和是多少？
<gadget id="calculator">20 + 30</gadget>
<output>50</output>

<result>50</result>