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I am an odd number, take away two letters and I am even

In an alien land far away, half of 10 is 6. If the same proportion holds true, then what is 1/6th of 30 in this alien land?

One out of 9 otherwise identical balls is overweight. How can it be identified after 2 weighings?

One fourth of the population of a newly discovered planet have 4 legs. The rest have two legs. There are 60 legs total. How big is the population of the newly discovered planet?

I am a white and black board in which some one moves us

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