# 10 DEBIT CARD IN AN ENVELOPE 10 CUSTOMERS PICK ONE EACH HOW CAN 1 BE LEFT IN THE WALLET RI RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

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## Solving 10 Debit Card In An Envelope 10 Customers Pick One Each How Can 1 Be Left In The Wallet Ri Riddles

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## 100 Blank Cards Riddle

Hint: Perhaps thinking in terms of one deck is the wrong approach.
Yes!

A sample strategy:
Divide the deck in half and turn over all lower 50 cards, setting aside the highest number you find. Then turn over the other 50 cards, one by one, until you reach a number that is higher than the card you set aside: this is your chosen "high card."

Now, there is a 50% chance that the highest card is contained in the top 50 cards (it is or it isn't), and a 50% chance that the second-highest card is contained in the lower 50. Combining the probabilities, you have a 25% chance of constructing the above situation (in which you win every time).

This means that you'll lose three out of four games, but for every four games played, you pay \$40 while you win one game and \$50. Your net profit every four games is \$10.

Obviously, you have to have at least \$40 to start in order to apply this strategy effectively.
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## 100 Floors Riddle

Hint:
He is short, so he can't reach the 100th floor button. On rainy days, he can use his umbrella to poke the button.
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Solved: 58%

## 100 Widgets Riddle

Hint:
It would take 5 minutes. Each machine takes 5 minutes to make its widget. Therefore, each of the 100 machines would have finished making its widget in 5 minutes.
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Solved: 63%

## 100 Meter Sprint Riddle

Hint:
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Solved: 0%

## 100 Lawyers Riddle

Hint:
A whine cellar.
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Solved: 12%

## Less Than 100 Riddle

Hint:
45 (1/5 of 45 = 9, 9 + 45 = 54)
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Solved: 48%

## 100 Billion Neurons Riddle

Hint:
A hare-brained idea!
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Solved: 12%

## The 100th Floor Riddle

Hint:
The man was a dwarf. On rainy days he had an umbrella to help him press the button 100.
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Solved: 70%

## 108 Spiders Riddle

Hint:
A spinning wheel!
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Solved: 50%

## 100 Politicians Riddle

Hint:
Yes, from the information you know 1 is honest and 99 are liars.

One of them is honest satisfying the first piece of information. Then if you take the honest man and any other politician, the other politician must be a liar to satisfy the second piece of information, 'If you take any two politicians, at least one of them is a liar.' So 99 are liars.
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