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The surface area of a spherical balloon measured in square inches is the same as its volume, measured in cubic inches.
What is the diameter of the balloon?
[Ref: ZEZW]
Direct Link: www.brainbashers.com?ZEZW
Hint: The volume of a sphere is (4/3) * Pi * (r^3).
Answer: 6 inches.
The surface area of a sphere, of radius r, is 4 * Pi * (r ^ 2) and the volume is (4/3) * Pi * (r^3). Putting these equal and cancelling gives r = 3, which means the diameter is 6 inches.
Puzzle 34
At a recent visit to the reptile house at the local zoo, I counted a total of 27 heads and 70 feet.
I was counting snakes, lizards and people and I know that there were exactly twice as many lizards as people.
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