Find a % chance to meet or beat a number knowing a dice's average roll

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A 6 Sided Dice's average roll is 3.5.

I want to roll three 6 Sided Dice and meet or beat an arbitrary number 30% of the time. How do I figure out what that arbitrary number needs to be to meet or beat it 30% of the time?

And how do I figure out what the arbitrary number should be if I want to meet or beat it 60% of the time?

Thank you for your help.