The World's 200 Hardest Brain Teasers: Mind-Boggling Puzzles, Problems, and Curious Questions to Sharpen Your Brain by Gary Gruber

Author:Gary Gruber [Gruber, Gary]
Language: eng
Format: epub, pdf
Tags: Games & Activities, Logic & Brain Teasers, Non-Fiction, Puzzles, Reference
ISBN: 9781402257513
Google: sesXaPoWyb0C
Amazon: 1402238576
Publisher: Sourcebooks
Published: 2010-07-31T23:00:00+00:00

32. From first to last: John, Mary, Sarah, Barry

The easy way to find the answer is to draw the situation with labels for the people’s names.

(1) Sarah is between Barry and Mary: B S M or M S B.

(2) John is directly in front of Mary: J M

(3) Mary is in front of two other people: M S B

So we get from (2) and (3): J M S B

33. One-half the surface area of a ball is greater. Blow up the circle like a balloon to get the ball. One half the surface area of the ball is greater than the area of the circle because the circle is being expanded by being blown up.

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