Money For Answers

A dad offered to pay his son $5 for every correct answer on his math test. His son said he would pay his Dad $8 for every incorrect answer. There were 26 questions on the test and no money was exchanged.

How did this happen?

The son got 16 questions correct and missed 10. This means he owed his Dad 10 * $8 = $80, but his Dad owed him 16 * $5 = $80, so it was a wash.
Two math equations to solve it are x + y = 26 and 5x = 8y.

Posted in Brain Teasers

B C D

B, C, D, E, G, P

What is the next letter in the sequence?

T. All of the letters rhyme.

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Twice in Eternity

I occur twice in eternity,
And I’m always within sight.

What am I?

The letter ‘t’.

Posted in Riddles
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Three Items for $100

Bill buys three items at the store for exactly $100. The second item costs half as much as the first item, and the third item is half as much as the second.

How much did each one cost?

First: $57.14
Second: $28.57
Third: $14.29

Posted in Brain Teasers

A Big Rig Crossing a Bridge

An 18-wheeler is crossing a 4 kilometer bridge that can only support 10,000 kilograms and that’s exactly how much the rig weighs. Halfway across the bridge a 30 gram sparrow lands on the cab, but the bridge doesn’t collapse. Why not?

Since the bridge is 4 kilometers long, the halfway point would be 2 kilometers. The 18-wheeler would have used much more than 30g of fuel to drive 2 kilometers.

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That That Is Is

Add punctuation to these words to make a grammatically correct series of phrases.

That that is is that that is not is not is not that it it is

That that is, is; that that is not, is not. Is not that it? It is.

There are almost assuredly other grammatically correct variations. Feel free to add ones you can think of in the comments.

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English and Afrikaans

What is a six-word sentence that has the same meaning and spelling in both English and Afrikaans?

My pen is in my hand. It’s not all that meaningful of a sentence, but it’s the same in English and Afrikaans.

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I Am Big And Mighty

I am big and mighty, and scared of sharp objects.
I feed everyone and watch people go by.
I have my feet stuck and hate talking with my big mouth.

What am I?

A tree.

Posted in Riddles

What Work is Never Finished?

What work can one never finish?

An autobiography. Unless you’re writing it in your death bed I suppose, but even then, how will you be able to record the time of death?

Posted in Riddles

How Old is Malcolm, His Dad and Grandfather?

Malcolm is the number of weeks of his father’s age treated as days and his grandfather’s age in months. All three of their ages add up to 120 years. How old is Malcolm, his father and his grandfather?

Malcolm is 6.
The father is 42. 42 days = 6 weeks.
The grandfather is 72. 72 months = 6 years.

Posted in Brain Teasers