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Finley’s Flaky Friends

Finley’s friends all chipped in to buy her a wedding gift. At first, ten friends agreed to contribute the same amount. Then two “friends” dropped out. The remaining eight had to add another dollar each to cover the cost of the gift. How much did the gift cost?


Let x be the amount the ten friends initially agreed to pay. We can then make the following equation:

10x = 8x + 8

Solving for x gives us $4, thus the gift cost 10 × $4, or $40.

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Alone I’m Unknown

Alone I’m unknown,
With my twin I’m twenty,
And triplets make me a warning.

What am I?

The letter ‘X’. A single x is often used in math as an unknown, along with Mr. X. Two together (XX) make the Roman numeral 20, and three signifies a warning for adult only content, or a warning to other programmers of a problem in source code.

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How to Stay Dry?

A group of ten people are going out for pizza but only two of them have an umbrella to keep them dry. Somehow they are able to walk all the way to the pizza place without getting wet. How?

It’s not raining.

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I Sleep By Day

I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?

A bat.

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Leaves That Don’t Fall

I have wood but no bark,
And leaves that don’t fall,
I am made up of branches,
and come in sizes of all.

I am completely devoured many times,
over and over by a worm of a kind.
If you want to know the answer of mine,
look for the secret that I’ve stored inside.

What am I?

A library or bookstore.

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The 22nd and 24th Presidents of the U.S.

The 22nd and 24th presidents of the United States of America had the same parents, but were not brothers. How is this possible?

It was the same guy! Grover Cleveland is the only president in history to serve two, non-consecutive terms.

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Kevlar, Fire Escapes and Wipers, Oh My!

What do computer compilers, kevlar, fire escapes and windshield wipers all have in common?

They were all invented by women.

A variation of this brain teaser includes laser printers (they were invented by Gary Starkweather) and bulletproof vests (invented by Casimir Zeglen using silk, though modern vests use Kevlar, so it’s halfway right).

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Sixteen, Twenty-six, Then What?

Fill in the missing numbers in this number series.

16, 26, ?, 43, 50, ?, 61, 65, ?, 70, 71

The method to create the series is start by adding 10, then decrease the addend by 1 for each new number in the sequence. That gives us:

16 + 10 = 26
26 + 9 = 35
35 + 8 = 43
43 + 7 = 50
50 + 6 = 56
56 + 5 = 61
61 + 4 = 65
65 + 3 = 68
68 + 2 = 70
70 + 1 = 71

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The Tail of a Dragon

What animal can be created from the head of a lamb, the body of a pig, the hind quarters of a buffalo and the tail of a dragon?

A lion.

Head of a lamb = L
Body of a pig = I
Hind quarters of a buffalo = O
Tail of a dragon = N

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Walk On the Living

Walk on the living, they don’t even mumble,
Walk on the dead, they mutter and grumble.

What are they?

Leaves. They’re soft and silent when they’re alive but crunchy when dead.

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