Which coin is heavier?
If we give a number for each coin, say 1, 2, 3, 4, 5 and 6. We can put the coin 1 and 2 on the left side, coin 3 and 4 on the right side of the balance.
If the left side is heavier, then we can put coin 1 on the left side and coin 2 on the right side. Whichever side is heavier, the coin on that side is heavier.
If the right side is heavier, then we can put coin 3 on the left side and coin 4 on the right side. Whichever side is heavier, the coin on that side is heavier.
If they are balanced, then then we can put coin 5 on the left side and coin 6 on the right side. Whichever side is heavier, the coin on that side is heavier.
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