The sum of two numbers is 27.5, if one number increases by 3.5 and the other number decreases by 4.5, what is the sum
两个数的和是27.5，如果一个数增加3.5，另一个数减少4.5，和是多少
<gadget id="calculator">4.5 - 3.5</gadget>
<output>1</output>

<gadget id="calculator">27.5 - 1</gadget>
<output>26.5</output>

<result>26.5</result>