Answer:
21/50
Explanation:
Fraction that voted for team A = 7/10
Fraction of those that wear red cap = 3/5 of fraction of team A
Fraction of those that wear red cap = 3/5 of 7/10
Fraction of those that wear red cap = 3/5*7/10
Fraction of those that wear red cap = 21/50
Hence the fraction of people that wear red cap is 21/50