Word Problems?

1) Steven has 9 gold coins that are identical in appearance. However, one coin is counterfeit and weighs slighlt less than the others. Using a balance scale, how can he find the counterfeit coin in just two weighings?
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2) In the following problem, the letters A, B and C stand for 3 different digits. What digit should replace each letter?

ABC+ACB=CBA

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