Data Sufficiency

Thank you

maximum points a team can earn is 6 points

1st - 5 points
2nd - 4 points
3rd - 3 points
4th - 2 points
5th - 1 point
total = 15

Let 2 teams get the maximum points i.e. 6

6+6 = 12

Therefore minimum points a team could get is 15-12 = 3


Hope this helps.

When you want to minimze something, you have to maximize the other possibilities.
Teams A,B,C.
If you want to minimze the number of points of A, you have to maximize the number of points of B and C. If B,C cannot have more than 6 points, so let's give them the maximum that we can:6 each. Given there are 15 points, A will have 3 points at minimum.