Personal Comment: Just remember the properties of circles.

2 Wheels Rotating Enigma

What we know: Imagine wheel A, with diameter x, rolling around fixed wheel B, with diameter 2x.

Enigma: How many revolutions about its own axis will wheel A make in roling once around wheel B?

Solution: 3 revolutions. Since Wheel A has half the diameter of B, this produces two rotations with respect to B. The rotation itself adds a third rotation with respect to the observer from above. A total of 3 revolutions

See who got this right

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