probability question

155 wolves 65% are red wolves 35% are brown wolves -- all carry brow allele 48% of red wolves carry recessive brown allele What is the probability that a wolf carries brown allele

relative fitness

You find that out of 20 of red wolves released, 18 survive, and out of 10 brown wolves released, 4 survive. What is the relative fitness of red and brown wolves? I have the fitness of the red wolves (favored genotype?) as 1, but I keep getting a negative number for the brown wolves' fitness.