projectEUREKA - a collection of problems, puzzles and trivia

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Showing 10 problems

Problem 6 - GMAT - Solution Verified

What is x - y?

1) x + y = 8

2) x - 2y = 2

A) if statement (1) by itself is sufficient to answer the question, but statement ...
Solve it!

175 correct answers, 233 tries, 3 commented solutions , 10 solvers: Robert Benea (robenea) (alvaro) (stefanu) Virgil (virgilm) Michael Smith (the_dude) Sebi (sebics) (anerey) Bogdan Stefan (bstefan) Lucian Badea (eklipsse) Dan Dima (heartwork) (Show all user statistics)

Submitted by Robert (uzurpatorul) on February 28 2009 | Discuss

Tags gmat

Problem 9 - Crossing the bridge - Solution Verified

Four men want to cross a bridge. The bridge is of a width such that a maximum of 2 people may cross at a time.

One man takes ...
Solve it!

208 correct answers, 814 tries, 1 commented solution , 10 solvers: Anca Vladeascu (vladeasca) Michael Smith (the_dude) Bogdan Stefan (bstefan) (anerey) Robert (uzurpatorul) Lucian Badea (eklipsse) Bogdan Mitu (bogdanm) (cesar) Vishwas Bhat (vishwasbhat) Andrei Radulescu (andreir2000) (Show all user statistics)

Submitted by Robert Benea (robenea) on March 01 2009 | Discuss

Category interview, Tags puzzle bridge interview

Problem 14 - Trivia - Solution Verified

What's the 3rd planet from the Sun?
Solve it!

125 correct answers, 141 tries, 4 commented solutions , 10 solvers: Robert (uzurpatorul) (alvaro) Bogdan Stefan (bstefan) (anerey) Robert Benea (robenea) Bogdan Mitu (bogdanm) Vishwas Bhat (vishwasbhat) Ana Santos (anasantos) R. Grange (rgrange) (flounders) (Show all user statistics)

Submitted by Robert (uzurpatorul) on March 02 2009 | Discuss

Category trivia, Tags trivia

Problem 23 - Average speed - Solution Verified

If a hiker averages 2 miles/hr uphill and 6 miles/hr coming back the same trail, what is his average speed going both ways?

Note: ...
Solve it!

133 correct answers, 222 tries, 4 commented solutions , 10 solvers: (alvaro) Robert Benea (robenea) Virgil (virgilm) Michael Smith (the_dude) (stefanu) Sebi (sebics) Bogdan Stefan (bstefan) (anerey) Robert (uzurpatorul) Lucian Badea (eklipsse) (Show all user statistics)

Submitted by Anca Vladeascu (vladeasca) on March 09 2009 | Discuss

Tags puzzle gmat math

Problem 687 - Supercooled water in the freezer - Solution Verified

I put a bottle of water in the freezer every night before bed. In the morning, I take it out and drink it.

What are the possible ...
Solve it!

162 correct answers, 346 tries, 2 commented solutions , 10 solvers: (guest) (Moonbeam) (viva) (taylash24) (sk2) Virgil (virgilm) (yelly) (bobbygriffin) (pivo) (Astrogat) (Show all user statistics)

Submitted by (kokoshanel) on November 02 2009 | Discuss

Category trivia

Problem 4 - GMAT - Solution Verified

On two of his tests, Harry scored 30 out of a maximum of 50 and on the third he scored 40 out of a maximum of 100? What is his average ...
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99 correct answers, 197 tries, 2 commented solutions , 10 solvers: (alvaro) Bogdan Stefan (bstefan) (anerey) Robert Benea (robenea) Bogdan Mitu (bogdanm) Vishwas Bhat (vishwasbhat) Ana Santos (anasantos) (flounders) (swapspace) Doug Shasteen (dougs) (Show all user statistics)

Submitted by Robert (uzurpatorul) on February 28 2009 | 1 Comment

Tags gmat sat quantitative

Problem 30 - 100! - Solution Verified

Consider the number 100!, wow many zeros are there at the end of 100!

Note: N!(N factorial) = 1 x 2 x ... (N-1) x N
Solve it!

122 correct answers, 566 tries, 4 commented solutions , 10 solvers: Dan Dima (heartwork) Robert (uzurpatorul) Robert Benea (robenea) Virgil (virgilm) Sebi (sebics) (alvaro) Lucian Badea (eklipsse) Bogdan Stefan (bstefan) Bogdan Mitu (bogdanm) Andrei Radulescu (andreir2000) (Show all user statistics)

Submitted by Michael Smith (the_dude) on March 17 2009 | Discuss

Category general, Tags puzzle brain teaser math factorial

Problem 17 - Light bulbs - Solution Verified

There are 100 light bulbs lined up in a row in a long room. Each bulb has its own switch and is currently switched off. The room ...
Solve it!

85 correct answers, 97 tries, 6 commented solutions , 10 solvers: (alvaro) Robert (uzurpatorul) Bogdan Stefan (bstefan) (anerey) Bogdan Mitu (bogdanm) Vishwas Bhat (vishwasbhat) Ana Santos (anasantos) (flounders) (swapspace) Doug Shasteen (dougs) (Show all user statistics)

Submitted by Anca Vladeascu (vladeasca) on March 08 2009 | Discuss

Category interview, Tags puzzle brain teaser interview google

Problem 24 - TV quiz - Solution Verified

On a TV quiz show a contestant is shown three closed doors and told that two of them have nothing behind them, but that one has a ...
Solve it!

78 correct answers, 92 tries, 2 commented solutions , 10 solvers: Robert Benea (robenea) Virgil (virgilm) Michael Smith (the_dude) Bogdan Stefan (bstefan) (anerey) (alvaro) Lucian Badea (eklipsse) Shaun A (Shaun) Bogdan Mitu (bogdanm) (cesar) (Show all user statistics)

Submitted by Anca Vladeascu (vladeasca) on March 09 2009 | Discuss

Tags puzzle probability math

Problem 335 - The Bear - Solution Verified

A vegetarian bear falls into a hole in the ground. The hole is 10 meters deep. After one second the bear reaches the bottom of the ...
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176 correct answers, 1971 tries, 5 commented solutions , 10 solvers: (guest) Nirmal Kirtisinghe (nirmalsuki) (dimachka) (DuraCell) (octav) (Lazarus) Dan (6dd4) (maest) (skeptical scientist) (Moonbeam) (Show all user statistics)

Submitted by Robert (uzurpatorul) on June 12 2009 | Discuss

Category general, Tags puzzle physics

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Project Eureka is a collaboratively edited site for problem solvers/creators - regardless of problem or field.

We are a bunch of math enthusiasts who decided to create a website for submitting and solving problems.
However, project Eureka is not limited to math problems; any problem, puzzle, or trivia question can be submitted to project Eureka. Similarly, for people who prepare for various tests, project Eureka offers the possibility of grouping multiple problems in a test and simulate a standardized test environment.

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