boolean algebra simplification

i have a boolean expression from a book im reading and im having trouble understanding the process of simplifying and drawing a conclusion.

its based around the process of buying a cat that fits certain criteria. heres the key

m = male cat
f = female cat
n = neutered cat
u = unneutered cat
w = white cat
t = tan cat
b = black cat

heres the expression

(m x n x (w + t)) + (f x n x (1-w)) + b
here he substitutes 0’s and 1’s
(1 x 0 x 1) + (0 x 0 x 1) + 0 = 0 + 0 +0 = 0

in the book the first cat is male unneutered tan. the books example substitutes the letters for zeros and ones and thats where i get lost. can anyone guide me through the process