The real-world problem that could be solved with the sum of -50 + 25 is:
Lauren owes her mom $50 so she babysat and earned $25.
In this scenario, the -50 represents the $50 debt to her mom, and the +25 represents the $25 she earned from babysitting. So, the sum (-50 + 25) represents her new balance after earning money against her debt, which is -25 (meaning she still owes her mom $25).