Question:
In a singing competition, the ratio of male participants to female participants was 1 : 5 at first. After the first round of competition, 25% of the male participants and 60% of the female participants did not make it to the second round. In the second round, there were 15 more female participants than male participants.
(a) What was the ratio of the number of female participants to the number of male participants in the second round?
(b) How many more female than male participants were there at first?