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In an alloy of 100 pounds of zinc and copper, there are 75 pounds of copper. How much copper must be added so that the alloy may be 10% zinc?

A ball is dropped from a height of 60 meters above the ground. How long does it take to hit the ground?

I am a three digit number. The product of my digits is two. I am a odd number, greater than 200. What number am I?

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