Points system in competition to avoid ties

I have been given a task and I am not really sure how to achieve it, thought i might ask here.
We have three teams: team 1, team 2, team 3
Four tasks: task 1, task 2, task 3, task 4
For each task and completion team is given points.
Is there a way to appoint points for 1st, 2nd, and 3rd place so that at the end there is no way two teams will have the same amount of points?
Task 1 and 2 have to have the same point system. Task 3 needs to have the biggest impact.
For example:
Task 1 and Task 2: 1st = 10 points, 2nd = 7 points, 3rd = 4 points
Task 3: 1st = 20 points, 2nd = 15 points, 3rd = 10 points
Task 4: 1st = 15 points, 2nd = 10 points, 3rd = 5 points.

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