The sum of two numbers is 31.7. If one number increases by 3.5 and the other number decreases by 2.5, what is the sum of the two numbers?
两个数的和是31.7，如果一个数增加3.5，另一个数减少2.5，这时两个数的和是多少
<gadget id="calculator">3.5 - 2.5</gadget>
<output>1</output>

<gadget id="calculator">31.7 + 1</gadget>
<output>32.7</output>

<result>32.7</result>