To find the ratio of chicken wings to sandwiches, you can express it as:
\[ \text{Ratio} = \frac{\text{Number of chicken wings}}{\text{Number of sandwiches}} = \frac{25}{40} \]
Next, simplify the fraction \(\frac{25}{40}\). Both 25 and 40 can be divided by their greatest common divisor (GCD), which is 5.
Dividing the numerator and denominator by 5:
\[ \frac{25 \div 5}{40 \div 5} = \frac{5}{8} \]
Thus, the ratio of chicken wings to sandwiches in simplest terms is:
\[ 5:8 \]
So, the final answer is \(5:8\).