Which situation cannot be represented by the equation 15 + x = 25?

Victor and Raul donated 25 cans of fruit to their local food bank. Victor donated 15 cans. What is, x, the number of cans Raul donated?

The day's low temperature read 15ºF. The day's high temperature read 25ºF. What is x, the amount of degrees the temperature increased throughout the day?

Jean has $25. She found $15 of the amount in her wallet and the rest in her coat pocket. What is x, the amount of money in her coat pocket?

Elizabeth worked 15 hours. Josh worked 25 hours. What is x, the amount of hours they worked together?