1 2 3 4 5 6 7 8 9 = 100

This equation is incomplete: 1 2 3 4 5 6 7 8 9 = 100

One way to make it accurate is by adding seven plus and minus signs, like so.

1 + 2 + 3 – 4 + 5 + 6 + 78 + 9 = 100

How can you do it using only 3 plus or minus signs?

123 – 45 – 67 + 89 = 100

Posted in Brain Teasers

Often There’s Only a Frown

I torture children and parents
Many people scream and wail in my presence
Parents drag their kids to me
I am supposed to create smiles,
But often there is only a frown.

What am I?

A dentist.

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Long and Thin

Long and thin, red within,
With a nail at the end.

What am I?

A finger.

Posted in Riddles

Against the Rules for You to Play Fair

It’s against the rules for you to play fair,
I always win but you don’t care,
I’ve ruined lives and crushed dreams,
But the allure is too much it seems.

What am I?

A casino. If you use methods to make the odds more fair to you, they kick you out. The house always wins, yet people continue to play. Gambling has ruined countless lives and crushed dreams of making millions, but the hope of winning continues to draw people in.

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Black Coat Rebus

What does this represent?

 black
-------
 coat

Black overcoat.

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I Build Up Castles

I build up castles.
I tear down mountains.
I make some men blind,
I help others to see.
What am I?

Sand.

Posted in Riddles

Two Scruffy Dogs

Two scruffy dogs were walking down the street. The first dog turned to the other and said, “Do you realize that if one of your fleas jumped onto me we would have the same number of fleas?” The second replied, “Yes, but if one of your fleas jumped onto me I would have five times as many fleas as you.” How many fleas are on each dog to begin with?

2 and 4

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The 500 Mile Race

Mike, Jimmy, Nader, Kevin, and Larry were the top five finishers in the regional 500-mile race. They drove yellow, orange, green, red and blue cars but not necessarily in that order.

Neither Kevin nor Larry drove the green car.
Kevin finished faster than Mike and Larry.
The blue car finished earlier than Larry’s and Nader’s car.
The yellow car finished faster than the green car and the orange car.
Mike’s and Larry’s car finished ahead of the orange car.
Jimmy’s car finished before the blue and the yellow car.

Who drove what color car and what place did each driver finish?

1st – Jimmy, red car
2nd – Kevin, blue car
3rd – Larry, yellow car
4th – Mike, green car
5th – Nader, orange car

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Six One Seven and Nine to Make Twenty Four

How can the numbers 6, 1, 7 and 9 be arranged to make 24?

91 – 67 = 24
(9 – 6) × (1 + 7) = 3 × 8 = 24

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One Six Seven Nine to Twenty Four

Given the numbers 1, 6, 7 and 9, find an equation that equals 24. You may only use each digit once.

91 – 67 = 24 or
(9 – 6) x (7 + 1) = 3 x 8 = 24 or
6 x √9 + 7 – 1 = 18 + 6 = 24

Posted in Brain Teasers