Answer:
90 male and 270 female
Explanation:
As the ratio is 3:9, 9-3=6. 180 females cover 6 parts, and there are total 12 parts. This means there are 360 people in the concert, and there are 30 people per part. As male covers 3 parts, 30x3=90 male, and female covers 9 parts, and 30x9=270 female. Hope it helps!