One Hundred With Six Identical Digits

How can you express the number 100 using the same digit six times?

99 + 99/99 = 100

Posted in Brain Teasers

Counting Squares

How many squares of any size are in this grid?

4 x 4 grid

30.

There are:

16 1×1 squares
9 2×2 squares
4 3×3 squares
1 4×4 square (the whole shape)

Hence, 16 + 9 + 4 + 1 = 30.

Posted in Brain Teasers

Money Is Right Above My Reach

Money is right above my reach, I’m barely staying out of The Emergency Room (It is right below me), Room #3 is to my left, Room #5 is to my right with a 5% interest rate.

What am I?

The number 4 key on a QWERTY keyboard. $ is money, ER (an abbreviation for Emergency Room) are the two letters immediately below the number 4 key, the #/3 key is to the left and the 5/% key is to the right.

Posted in Brain Teasers
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Horse Fence

Farmer Finnegan needs to build a fence to keep his horses on his property. He only has a little over 1.5 miles of fence materials, but there’s also a mile-long straight river running through his property. What shape should he use for the fenced in area to give his horses the most space possible?

Our dear friend Finnegan should build a half-circle fence with the river as the diameter, giving the horses about 0.4 square miles to frolic and play in.

Area of semi-circle = πr2 / 2 = π × .5 miles2 / 2 = 0.3927

Posted in Brain Teasers

Three Feet But No Head

What has three feet but no head?

A yard stick (it’s 3 feet long).

Posted in Riddles

Special Strengths

What’s special about the word “strengths”?

It has a record nine letters but only one vowel, and it’s one of the longest one-syllable words in English.

Posted in Brain Teasers

More You Take Away, The Bigger I Get

The more you take from me, the bigger I get. What am I?

A hole.

This is quite similar to It Cannot Be Seen and Weighs Nothing.

Posted in Riddles

Blindly Picking Socks

You have 12 black socks and 12 white socks mixed up in a drawer. You’re up very early and it’s too dark to tell them apart. What’s the smallest number of socks you need to take out (blindly) to be sure of having a matching pair?

Sock drawer

Three socks. If the first sock is black, the second one could be black, in which case you have a matching pair. If the second sock is white, the third sock will be either black and match the first sock, or white and match the second sock.

Posted in Brain Teasers

Weight In My Belly

Weight in my belly,
Trees on my back,
Nails in my ribs,
Feet I do lack.

What am I?

A boat.

Posted in Riddles

Only One Color, But Not One Size

Only one color, but not one size,
stuck at the bottom, yet easily flies;
present in sun, but not in rain;
doing no harm, and feeling no pain.

A shadow.

Posted in Riddles