Secure Spy Transfer

You are a spy and need to send an item to a contact in another country without letting anyone else have access to it. All unlocked items will be opened in transit. How can you send this item securely?

Place a lock on the item and send it to your contact. They will place their own lock on the package and return it to you. You remove your lock and send it back. When they receive it, they can unlock the package and retrieve the item.

Posted in Brain Teasers

Lots and Lots of Granola Bars

Marla needs snacks for the students on her field trip. She bought 9 boxes of granola bars containing a total of 88 bars. She wanted variety, so she bought 3 different flavors, which happened to come from 3 different companies.

The Coconut Almond bars were packaged 8 to a box.
The Chewy Chocolate Chip bars came 10 to a box.
The Oats ‘n Honey package contained 12 per box.

She bought the most boxes of Coconut Almond but had the most Oats ‘n Honey bars.

How many of each did she buy?

Coconut Almond: 4 boxes × 8 in a box = 32 bars
Chewy Chocolate Chip: 2 boxes × 10 in a box = 20 bars
Oats ‘n Honey: 3 boxes × 12 in a box = 36 bars

Posted in Brain Teasers

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

How Old is Lilly?

Two days ago Lilly was 7 years old. Next year she will turn 10. How can this be?

Her birthday is December 31st. Today is January 1st so she was 7 two days ago, and turned 7 last year. Now she’s 8 and will turn 9 this year. And next year she’ll turn 10.

For example, if today is 01 Jan 2015:

30 Dec 2014 = age 7 (two days ago)
01 Jan 2015 = age 8 (today, she turned 8 on 31 Dec 2014, which was last year)
31 Dec 2015 = age 9 (her birthday this year)
31 Dec 2016 = age 10 (her birthday next year)

Posted in Brain Teasers

Always Old, Sometimes New

Always old, sometimes new.
Never sad, sometimes blue.
Never empty, sometimes full.
Never pushes, always pulls.

What am I?

The moon. The moon has been around for quite some time, but there’s a “new” moon every month or so. A Blue moon is a rare event. The moon is a body of rock, so it’s never empty, but we do see what we call a full moon some nights. And the moon’s gravity “pulls” on the ocean to create low and high tides, but it doesn’t push anyone around because it’s a friendly fellah.

Posted in Riddles
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Traveling Colorful Balls

Kevin, Charles, Larry and Alex are in a room that’s about 110 feet long. In front of them are 5 balls which are exactly 100 ft from the exit. The balls are yellow, purple, green, red and blue, respectively. Each man must carry a ball to the exit. After traveling 20 ft a ball will change color twice. The sequence of color changes is always the same: yellow, purple, green, red, and blue.

At 80 ft Kevin’s ball is red.
At 40 ft Larry’s ball is purple.
At 60 ft Charles’ ball is blue
At 100 ft Alex’s ball is purple.

What color ball was left behind?

The remaining ball was blue. Here’s a table of each ball and the color it changes to at 20, 40, 60, 80 and 100 ft. Kevin’s started out yellow, Larry’s was green, Charles’ was red and Alex began with a purple ball, leaving blue as the one nobody picked.

 20 ft40 ft60 ft80 ft100 ft
YellowGreenBluePurpleRedYellow
PurpleRedYellowGreenBluePurple
GreenBluePurpleRedYellowGreen
RedYellowGreenBluePurpleRed
BluePurpleRedYellowGreenBlue
Posted in Brain Teasers

A Foot On Each Side

What has a foot on each side and one in the middle?

A yard stick.

Posted in Riddles

Just Two Letters

Using just two letters, fill in the blank letters below to make five English words. The letters are not always in the same order and the same letter may of course be used more than once. What are the words?

1. _ N T _ I N _
2. V I _ _ _ R
3. _ H _ _ L
4. _ _ _ K
5. _ _ _

The two letters are E and W. They make the following words

1. ENTWINE
2. VIEWER
3. WHEEL
4. WEEK
5. EWE

Posted in Brain Teasers

Three Digits in a Row

On a regular 12-hour digital clock how many times would the same three digits in a row be displayed (e.g. 1:11, 11:12, 12:22) in one day?

34 times. These 17 instances will be visible twice in a 24 hour period.

1:11
2:22
3:33
4:44
5:55
10:00
11:10
11:11
11:12
11:13
11:14
11:15
11:16
11:17
11:18
11:19
12:22

Posted in Brain Teasers

A Blood Red Shroud

The thunder comes before the lightning,
And the lightning comes before the cloud,
The rain dries all the land it touches,
Wrapping the earth in a blood red shroud.

What am I?

A volcano.

Posted in Riddles