Weighing All

What four weights can be used to balance from 1 to 30 pounds?




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In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
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Amazing Facts

Rubik’s Cube

The inventor of the Rubik’s Cube didn’t realize he’d built a puzzle until he scrambled it the first time and tried to restore it.