|How do you tell when you run out of invisible ink?|
Math Puzzle Answer
You have found the answer to one of our math puzzles. We have several other puzzles for you to figure out. Please click to see all our math puzzles.
CD Track Lengths - Answer
The lengths of the tracks are (5, 7, 17, 19), (7, 11, 13, 23) and (7, 13, 17, 23).
None of the track lengths can be 2 because any sum of the three different primes, including 2, would not be prime. Therefore, the track lengths must be chosen from the 13 primes between 3 and 43.
To get the answer, find all three prime combinations whose sum is a small enough prime that another prime (larger than any of the three) can be added to result in a sum of 60 or less.
There are 14 such combinations: (3, 5, 11), (3, 5, 23), (3, 7, 13), (3, 7, 19), (3, 11, 17), (5, 7, 11), (5, 7, 19), (5, 11, 13), (5, 13, 19), (7, 11, 13), (7, 11, 19), (7, 13, 19), (7, 13, 17) and (11, 13, 17).
If you try all possible fourth primes with those combinations, you'll find that the only possibilities which meet the requirements (sum of 60 or less and sum of any three is a prime) are the answers given above.
Cryptic Math Puzzles
Hard Math Puzzles
Word Picture Puzzles
Play Mastermind Same Game Play ShisenSho
Car Games Skiing Games Football Games Free Kid Puzzles Magic Triangle Game
US Jokes Hilarious Blonde Jokes I have Learned...
Play Javaroids Kid Games Play Black Viper FastLap Dublin Driving Game Wermz Online Game Classic Online Games
Stereogram Pictures Weird Illusions Visual Illusions
Report A Broken Link Contact Information
Site Map |
Privacy & Security |
Contact Us |
Purchase Agreement |