1/20 of the groupGiven:Total children = 40Children who play brass = 4Fraction who play trumpet = 2/5Step 1: Find how many of the brass players play trumpet.4 × 2/5 = 8/5 = 1.6Step 2: Since the number of children must be whole, round or interpret based on context:Approximately 2 children play the trumpet.Fraction of total group:2/40 = 1/20 of the group are trumpet players.