Use the formula from
Exercise 107( W=91.4-(10.5+6.7Sqrt(x)v-0.45v)(457-5t)/110 ) to determine who will feel colder:
a person in Minneapolis at 10°F with a 15-mph wind
or a person in Chicago at 20°F with a 25-mph wind.
I'm not sure about your symbols and what they mean. I assume that v = wind velocity and t = temperature, but what do x and the A term mean? Does W stand for some measure of subjective feeling?
If you know the values, substitute them in the formula and compare your results.