The value has decreased by 25 from the original 25, which results in a decrease of 0. This means there was no actual decrease in the value after the subtraction.
The student has a given value of 25, and they want to know by how much the value has decreased after a decrease of 25. To calculate the decrease, we simply subtract the decreased amount from the original value.
In this case: 25 - 25 = 0. Therefore, the value has decreased by 0 after decreasing by 25. The answer is not negative because we are looking for the amount of decrease, not the resulting value.
After decreasing the original value of 25 by 25, the amount by which it has decreased is 0, which means there was no actual decrease.