In a fitness club, the ratio of male and female is 3:2. Base on their ability level, they are group into 3 different groups, A,B, and C, and the ratio of members in A, B, and C is 10:8:7. In group A, the ration of male to female is 3:1, and in group B, the ratio is 5:3, what is the ratio of male to female in group C?