Let no. of shirts be x.
Chris -- 7x
Brian --- 5x
132x/(7x+5x) = 11
x=11
Chris sold (11 x 7) shirts = 77 shirts
Brian sold (11 x 5) shirts = 55 shirts
I wanna say x=3 because 8 times 3 is 24 times 3 is 72 + 8 is 80
F(X)= x+1/4x-2
f(2) = (2 + 1)/[(4)(2) - 2]
f(2) = 3/6 = 1/2