Mensa No. 50



A frog sits on a lily pad in the precise middle of a circular pond with a radius of 6 meters (19 feet).  He jumps straight toward the edge of the pond a distance of 3 meters (9 feet, 6 inches), but this tires him and every subsequent jump is precisely half the distance of the jump before (i.e., 1.5 meters (4 feet, 9 inches), 75 cm (2 feet, 4.5 inches), etc.).


How many jumps does it take him to reach the edge of the pond?

​​Mensa No. 512

A Row of Colorful Cars

There are seven cars waiting at the traffic lights.
The green car is immediately behind the black car.

The white car is immediately behind the silver car.
The blue car is the last in line.
The red car is the only car between the white car and the black car.

There are three cars between the white car and the grey car.

What is the order of the seven cars?

Brain Teaser of the Quarter

"Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices, but honestly and courageously uses his intelligence and fulfills the duty to express the results of his thought in clear form."---Albert Einstein

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All submissions are responded to with the answer.


Silver, White, Red, Black, Green, Grey, Blue.