A student places a steak on one side of a double balance pan. She adds weights of known mass to the other side until both sides balanced, then she eats three fourths of the steak and places it back on the scale. What will happen to the balance?
1) The balance will remain unchanged.
2) The balance will tilt towards the side with the steak.
3) The balance will tilt towards the side with the weights.
4) The balance will tilt towards the side with the eaten portion of the steak.

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