Next in the Sequence

Here is a series of numbers. What is the next number in the sequence?

1
11
21
1211
111221
312211

13112221

The next number in the series counts the previous numbers. Thus the first number is 1, which is one 1, or 11. To describe 11, you have two 1’s, or 21. Now you have one 2 and one 1, so the next number is 1211. The solution is to continue describing the previous number using only numbers.

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Days Before August 17th

How many days before August 17th is it, if fifty days ago, it was four times as many days since March 30th?

18 days or July 30th.

17 August – 18 days = 30 July.
30 July – 50 days = 10 June.
10 June – 30 March = 72 days, which equals 4 × 18.

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The Peace Maker Weapon

What weapon is also a peace maker?

Note: Think homonyms

A knife. It turns things into pieces.

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Cops Close Cellar Corpse

Replace the letters with numbers to make this a valid mathematical equation.

    COPS
   CLOSE
  CELLAR
  CORPSE
    CASE
+ COLLAR
--------
  RECTOR
    2730
   29704
  249918
  278304
    2104
+ 279918
--------
  842678
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Lending Money to Darlene

Franklin lent Darlene as much money as she already had, then she spent $10. The next day, Franklin lent her as much money as she now had and again, she spent $10. On the third day Franklin once again lent her as much money as she now had and she spent $10, leaving her broke. How much money did Darlene start with?

$8.75
You may have been tempted to guess $30 because $10 is spent three times, but that would mean she would have had $60 ($30 lent plus the $30 she already had), and $50 after spending $10. The rest of the numbers end up at higher than zero, so we know it has to be less than $30. Even starting at $10 leaves Darlene with $10 on the third day. Starting with $8.75 works out as follows.

Day 1: $8.75 (lent) + $8.75 (already had) – $10 (spent) = $7.50 (remaining)
Day 2: $7.50 + $7.50 – $10 = $5
Day 3: $5 + $5 – $10 = $0

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Word With All 26 Letters

What word contains all 26 letters?

Alphabet (unfortunately there aren’t any actual dictionary words with every letter in the alphabet, so this gimmicky, somewhat unsatisfying answer has to suffice).

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What Once Was Red Is Black Instead

Tear one off and scratch my head, what once was red is black instead. What am I?

A match. You tear a match out of a matchbook and scratch the head to light it, then the red tip turns black from the flame.

This is an exact duplicate of Tear One Off and Scratch My Head but I’m leaving it to avoid broken links.

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Often Talked Of But Never Seen

Often talked of, never seen,
Ever coming, never been,
Daily looked for, never here,
Still approaching, coming near,
Thousands for it’s visit wait,
But alas for their fate,
Tho’ they expect me to appear,
They will never find me here.

Tomorrow.

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Two Three Ten Sequence

If:
2 3 = 10
7 2 = 63
6 5 = 66
8 4 = 96
9 7 = __

What is the missing number?

f(n, m) = (n + m) × n

e.g. f(2, 3) = (2 + 3) × 2 = 10

Hence, f(9, 7) = (9 + 7) × 9 = 144

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Right Behind You Creeps on the Ground

It’s right behind you,
And creeps on the ground,
It follows you home,
But does not make a sound.
Careful when you turn around.

What is it?

Your shadow.

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