Riddles and Brain Teasers

Mysterious Math

This problem can be solved by preschool children in five to ten minutes, by programmers in an hour and by people with higher education…well, check it yourself.

8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9313 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
1012 = 1
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
2581 = ?

What is the missing number and why?

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Two. The number is how many closed circles there are in the 4 digits. 0, 6 and 9 each have one, 8 has 2.

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Four Nines To Make a Hundred

How can you make four 9’s equal 100?

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99 9/9 = 100

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Dumbstruck Beekeeper

Which word does not belong?

beekeeper, dumbbell, dumbstruck, untruthful

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Dumbbell. All of the other words have only one of the vowels (a, e, i, o, u).

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What Does Man Love More Than Life?

What does man love more than life
Fear more than death or mortal strife
What the poor have, the rich require,
and what contented men desire,
What the miser spends and the spendthrift saves
And all men carry to their graves?

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Nothing. This one is similar to Greater than God, but different enough to include it here.

Posted in Riddles

AADFJJ

A A D F J J J M M N ?

What comes next in the series?

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O S. The series contains the first letter of each month in alphabetical order (April, August, December, February, January, July, June, March, May, November). O and S represent the remaining 2 months, October and September.

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Tagged with sequence

Pleased With Their Death

Beulah died in the Appalachians while Craig died at sea. Everyone was much happier with Craig’s death. Why?

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Beulah and Craig were hurricanes.

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A NA A SA A

A NA A SA A A

What comes next in the series?

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E. Each item is the first letter(s) of one of the seven continents:

1. Asia
2. North America
3. Africa
4. South America
5. Australia
6. Antarctica
7. Europe

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Tagged with Series

What Letter Comes Next?

The letters in this series are ones that don’t begin something. Figure out what that something is, and what letter comes next.

B E J ?

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Q. The thing they don’t begin is states in the United States of America. The final three letters in the series are X, Y and Z.

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Mario’s Racing Grandma

Mario is testing out a new car at the racetrack. His grandmother took it for a mile lap and averaged 30mph. How fast does Mario have to drive in the second lap to average 60mph for the two miles?

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90mph is an alluring answer, but it’s impossible. At 90mph the second lap would take 40 seconds. If Grannie’s first lap at 30mph took 2 minutes, traveling 2 miles in 2 minutes and 40 seconds is an average speed of 45mph. Traveling an average speed of 60mph for 2 miles would take 2 minutes and since the grandma’s lap took all of those 2 minutes, even if Mario could break the sound barrier he wouldn’t be able to average 60mph.

Posted in Brain Teasers