Riddles and Brain Teasers

I Run Cold and Hot

I run cold and hot,
I look blue but am red.

What am I?

Blood. People can be referred to as hot blooded, and certain animals are cold-blooded. Your veins look blue, but the blood is actually red.

Posted in Riddles

Exist Between Two Things

It can only exist between any two things
and men know it well for the hardships it brings.

Show the answer »

Distance.

By Sef Daystrom

Posted in Riddles

No Head On Which A Hat To Place

I always run but never walk,
I sometimes sing but cannot talk,
No head on which a hat to place,
You always look me in the face.

What am I?

Show the answer »

A clock. It runs all the time, it “sings” for hourly chimes, cuckoos or alarms, it doesn’t have a head (but does have hands) and you look a clock in the face to tell the time.

Posted in Riddles

Debbie’s Dragster

Debbie starts driving her dragster from rest and constantly accelerates to 60 mph in 10 seconds. How far does she travel in those 10 seconds?

Show the answer »

1/12 mileTen seconds is 1/6 of a minute and 1 minute is 1/60 of an hour, so 10 seconds is 1/360 of an hour.If you graph her trip with the speed on the y-axis and the time on the x-axis, you get a triangle with height of 60 mph and width of 1/360 of an hour. To calculate the area of the triangle, you multiply 1/2 × 1/360 × 60 = 1/12.

1/12 mile

Ten seconds is 1/6 of a minute and 1 minute is 1/60 of an hour, so 10 seconds is 1/360 of an hour.

If you graph her trip with the speed on the y-axis and the time on the x-axis, you get a triangle with height of 60 mph and width of 1/360 of an hour. To calculate the area of the triangle, you multiply 1/2 × 1/360 × 60 = 1/12.

Posted in Brain Teasers

8 = S O A S S

What does this represent?

8 = S O A S S

Show the answer »

8 = Sides of a stop sign

Posted in Brain Teasers

Tagged with rebus

Kaitlyn’s Age Plus and Minus Three

Kaitlyn’s age plus three has an integer square root. Three years ago, Kaitlyn’s age was the square root.

How old is Kaitlyn?

Show the answer »

Kaitlyn is 6 years old.

6 + 3 = 9, and 9 has an integer square root.

6 – 3 = 3, and 3 is the square root of 9.

Posted in Brain Teasers

Special Two Letter Combinations

What do these three letter combinations have in common?

DE
HI
MN

Hint: These combinations don’t have it in common.

AK
IN
WY

Show the answer »

They are the only three US state abbreviations whose two letters are next to each other in the alphabet.DE – Delaware
HI – Hawaii
MN – Minnesota

They are the only three US state abbreviations whose two letters are next to each other in the alphabet.

DE – Delaware
HI – Hawaii
MN – Minnesota

Posted in Brain Teasers

I Am What Remains

I am what remains of what
was once a living whole,
dug in deep, protruding, though,
and unobtainable.

Show the answer »

A stump.

By Sef Daystrom

Posted in Riddles

Tagged with What am I?

Highest Product Using All Digits

What is the highest product that can be generated by multiplying two numbers while only using each digit once (1 through 9)?
For example, 12345678 * 9 = 111,111,102

Show the answer »

9642 * 87531 = 843,973,902

Posted in Brain Teasers

Hold In Your Left Hand

What can you hold in your left hand and not in your right?

Show the answer »

Your right elbow. You can try it yourself if you’re not convinced, but unless you have a broken arm or an incredibly flexible ulna, you won’t reach it.

Posted in Brain Teasers

More ›