The sum of the two numbers is 56.8. If one addend is increased by 19 and the other is decreased by 23, what is the sum of the two numbers?
两个数的和是56.8，如果一个加数增加19，另一个加数减少23，此时这两个数的和是多少
<gadget id="calculator">23 - 19</gadget>
<output>4</output>

<gadget id="calculator">56.8 - 4</gadget>
<output>52.8</output>

<result>52.8</result>