Yep! 2/4, also known as 1/2 is larger than 2/5. You can verify this by getting a common denominator of 20 by multiplying the top and bottom of 2/4 by 5 and the top and bottom of 2/5 by 4, and asking yourself of this is true: Does 10/20=8/20? No it does not! Therefore 2/4 is bigger than 2/5!
10 groups of 3 students = 30 3 groups of 10 students = 30 5 groups of 6 students = 30 6 groups of 5 students = 30 2 groups of 15 students = 30 15 groups of 2 students = 30