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

( 7 )

Overview

FLEX YOUR brain power like never before!

From acclaimed author Dr. Gary Gruber, whose proven critical-thinking methods have sold more than seven million books, this collection of mind-bending brain teasers is sure to challenge even the most experienced problem solver. Inside are logic puzzles, riddles, maddening math problems, mental games, and more!

A ship is twice as old as the ship's boiler was when the ...

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

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Overview

FLEX YOUR brain power like never before!

From acclaimed author Dr. Gary Gruber, whose proven critical-thinking methods have sold more than seven million books, this collection of mind-bending brain teasers is sure to challenge even the most experienced problem solver. Inside are logic puzzles, riddles, maddening math problems, mental games, and more!

A ship is twice as old as the ship's boiler was when the ship was as old as the boiler is. The ratio of the boiler's age now to the ship's age now is what?

What English word contains all the vowels, in alphabetical order?

What is the three-digit number that can be made from the digits 2, 3, 5, and 7 where no two digits in the three-digit number are alike, and where the three-digit number is a multiple of each of the digits chosen?

Stumped? Dr. Gruber reveals the fascinating explanations and detailed strategies for solving even the trickiest problems using his exclusive Gruber Method.

DISCLAIMER: The brain teasers in this book may get you so wrapped up in critical thinking that you may not be able to do your regular work until you solve them! Any abrupt or gradual increase in creativity, intelligence, or motivation to get a better job suited to your newfound talents is strictly the reader's responsibility.

For more than thirty years, Gary R. Gruber, PhD, has been recognized as a leading expert on the SAT, test-taking methods, and critical-thinking skills. His methods have been used by PBS, Sylvan Learning Centers, Grolier's Encyclopedia, and school districts throughout the country. Dr. Gruber's innovative problem-solving strategies make up the heart of the new MyMaxScore's online test prep (www.mymaxscore.com).

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Product Details

  • ISBN-13: 9781402238574
  • Publisher: Sourcebooks, Incorporated
  • Publication date: 8/1/2010
  • Pages: 208
  • Sales rank: 333,630
  • Product dimensions: 6.36 (w) x 11.22 (h) x 0.58 (d)

Meet the Author

Gary R. Gruber, PhD, is recognized nationally as the leading expert on the SAT, test-taking methods and critical thinking skills. His books on test taking and critical thinking skills have sold more than seven million copies.
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Read an Excerpt

The World's Hardest Brain Teasers

Here is a collection of my most interesting and mind-improving brain teasers. Many of the answers should give you a strategy for thinking, which will carry over to many other problems and provide you with thinking and problem-solving methods. There is no time limit for these questions (with exceptions as noted). Be aware that there may be more than one way to arrive at an answer to a question. Just remember, a person who can solve problems efficiently either knows a particular strategy for the type of problem or extracts something from the problem that is curious to him or her and that leads to the next step toward a solution.

1. Two U.S. coins add up to 30 cents. If one of them is not a nickel, what are the two coins?

2. Make one word from all the following jumbled letters:
o r e n o d w

3. In miles per hour, what is the average rate of a car going 20 mph and traveling back the same distance at 60 mph?

(a) 30
(b) 40
(c) 50
(d) 60
(e) cannot be determined unless the distance is given

4. If you don't know the meaning of the word PRECURSORY, which of the following words do you think means the opposite of PRECURSORY?

(a) flamboyant
(b) succeeding
(c) cautious
(d) simple
(e) not planned

5. An explorer found a silver coin marked 7 BC. He was told it was a forgery. Why?

6. I have only nickels, dimes, and quarters and have at least one of each type of coin. The total number of coins I have is fifteen and the total value of all the coins is $1.00. How many of each coin do I have?

7. A malicious computer program informs a user that it has "kidnapped" an important file and that what happens to the file will be based on the next statement to be typed by the user. If the user types a false statement it will delete the file, and if the user types a true statement it will change the file's name so it can never be found. The user types a statement that makes the computer unable to perform or shut down. What could the user have typed?

8. Terry is half as old as Alice was when Alice was five years older than Terry is now. How old is Terry now?

9. IMAGINARY NUMBERS is to REAL NUMBERS as

(a) spiritual : global
(b) infinite : finite
(c) prime : rational
(d) negative : positive
(e) disordered : ordered

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Customer Reviews

Average Rating 3
( 7 )
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Sort by: Showing all of 7 Customer Reviews
  • Posted September 15, 2010

    best brainteaser book yet

    I've read alot of Brainteaser books and this is the best one yet. There are problems I've been wanting to know the explanations to for years and those problems and the detailed solutions are in this book and all beautifully explained! Thank you for such enjoyment. I also feel that I'm getting more intelligent every day working on the problems. DS

    4 out of 4 people found this review helpful.

    Was this review helpful? Yes  No   Report this review
  • Anonymous

    Posted June 26, 2013

    Boo

    I want this book so I got the sample and I was dissatisfied. The whole sample was the introduction. What a waste of my time, because I spent my time reading it looking for at least one teaser, but NOPE! I am not getting the book after all.

    If you agree, share!

    1 out of 2 people found this review helpful.

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  • Anonymous

    Posted March 1, 2014

    Apprentaces den

    0 out of 1 people found this review helpful.

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  • Anonymous

    Posted March 4, 2013

    Boooooo!!!!!!!!

    Anonamus march 4 2013

    0 out of 1 people found this review helpful.

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  • Anonymous

    Posted January 26, 2013

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    0 out of 5 people found this review helpful.

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  • Anonymous

    Posted July 8, 2012

    GOOD

    I love it.

    0 out of 3 people found this review helpful.

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  • Anonymous

    Posted March 26, 2012

    Sucks

    I am the person from the second review. only reason why i put a star is because it would not let me post without one

    0 out of 4 people found this review helpful.

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