How to Save Gas

If you could chose to increase the average fuel economy of a car, which of these would save the most fuel?

1. 10mpg -> 12mpg
2. 12mpg -> 15mpg
3. 15mpg -> 20mpg
4. 20mpg -> 30mpg
5. 30mpg -> 60mpg

It turns out they all save the same amount of fuel.

If you travel 100 miles:

100 / 10 = 10 gallons used
100 / 12 = 8 1/3 gallons used

10 – 8 1/3 = 1 2/3 gallons saved

100 / 30 = 3 1/3 gallons used
100 / 60 = 1 2/3 gallons used

3 1/3 – 1 2/3 = 1 2/3 gallons saved

Posted in Brain Teasers

Wily Winifred and the Case of the Odd Numbers

Mrs. Shine was having a rough day and wanted a break. So she asked her class to calculate the sum of the first 50 odd numbers. In a few moments, Winifred was at her desk with the correct answer of 2,500. Stunned, Mrs. Shine figured she must have gotten lucky, and sent precocious Winifred back to her seat with the task of finding the sum of the first 75 odd numbers. Again, Winifred returned in seconds with the correct answer (5,625).

How did Winifred find the answer so quickly?

Winifred, being the precocious child she is, realized there was a pattern when computing smaller sums of odd numbers.

First 3: 1 + 3 + 5 = 9
First 4: 1 + 3 + 5 + 7 = 16
First 5: 1 + 3 + 5 + 7 + 9 = 25

Do you see the pattern like our dear friend Winnie?

For the first n odd numbers, the sum is equal to n2. Thus the first 50 is 502, or 2,500, and the first 75 is 752, or 5,625.

Posted in Brain Teasers

Asleep, Parts, Ideals Trianagrams

Rearrange the letters of the first word to form a new one, then rearrange the letters of the new word to form a third.

ASLEEP _ _ _ _ _ _ _ _ _ _ _ _
PARTS _ _ _ _ _ _ _ _ _ _
IDEALS _ _ _ _ _ _ _ _ _ _ _ _

1. ASLEEP, PLEASE, ELAPSE
2. PARTS, TRAPS, STRAP (TARPS or SPRAT also work)
3. IDEALS, SAILED, LADIES

Posted in Brain Teasers

I Have Four Pairs of Letters

I have four pairs of letters,
Leaving two to stand alone.
You’re often doing the opposite,
When playing on your phone.

I help you get things done,
With one big caveat,
If taken to extremes,
I could make you fat.

What am I?

Efficiency. Being efficient helps you get things done, but if you’re extremely efficient with your tasks you get less exercise.

Posted in Riddles
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Bird Flying Over the Ocean

When a bird flies over the ocean a part of the body touches the water but doesn’t get wet. What part is it?

The shadow

Posted in Riddles

I Will Stomp You If You Get In My Way

I roam through the land hoping to rescue my love. I search high and low and will stomp on you if you get in my way. What am I?

Mario, from Super Mario Brothers video game by Nintendo. He roams the land searching for the princess and his primary method of getting rid of folks is to stomp on them.

Thanks to Rowan for figuring this out.

Posted in Riddles

A Cloth Poorly Dyed

A cloth poorly dyed
And an early morning sky
How are they the same?

Their color both change easily.

Posted in Riddles

Hurt Without Moving

We hurt without moving.
And poison without touching.

We bear truth and lies,
But are not judged by size.

What are we?

Words.

Posted in Riddles
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Girls Like, Boys Use

What 8-letter word describes something girls like, boys use and parents are afraid of yet remember fondly?

Hint: It has these letters: macroitn

Romantic. Many girls like being romantic, boys become romantic to win the hearts of girls and parents are afraid of too much romantic activity with their kids, but remember their own romantic endeavors fondly.

Posted in Brain Teasers

Many and One

We are many and one,
We wave and we drum,
We will cover a stare,
With you everywhere.

What are we?

Hands.

Posted in Riddles
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