Question 1

Three friends split a bill of $30. They each pay $10. Later, the waiter realizes the bill was only $25, so he gives back $5. They each take $1, and give $2 to the waiter as a tip. So they each paid $9, totaling $27. Add the $2 tip → $29. Where is the missing dollar?

Accepted Answer

There is no missing dollar. The error comes from adding the $2 tip to the $27, when in fact the tip is part of the $27.  It's just a logical trick.

Question 2

The Disappearing Painting, A thief stole a painting from a museum with 24/7 security. No alarms went off. No one broke any locks. But the next morning, the painting was gone. Security footage shows no one entered or left. How was it stolen?

Accepted Answer

The thief hid inside the museum overnight.

Question 3

The Hat Trick You see five people in a line. Each wears a red or blue hat. They can only see the hats in front of them. Each is asked (from back to front): “What color is your hat?” The last person (who sees all 4 in front) always guesses right. How?

Accepted Answer

They use a pre-arranged parity strategy (e.g., say "red" if number of red hats is even). It’s logic, not luck.

Question 4

Add me to myself and multiply by 4. Divide me by 8 and you get me back. What number am I?

Accepted Answer

—Any number

Question 5

If 3 cats catch 3 mice in 3 minutes, how long for 100 cats to catch 100 mice?

Accepted Answer

— 3 minutes

Question 6

A stick is broken into 3 random pieces. What’s the chance they form a

Accepted Answer

triangle? — 1/4

Question 7

How many times do the hour and minute hands overlap in 12 hours?

Accepted Answer

— 11 times

Question 8

Multiply me by any other integer and the result is never prime

Accepted Answer

0 or 1 (strictly: 0; 1×prime = prime, so answer: 0)

Question 9

A pirate finds 10 gold coins and splits them evenly among 5 crew members, keeping none. How many coins per crew member?

Accepted Answer

2. (10 ÷ 5 = 2.)

Question 10

If you add my age to yours, the total is 90,” Grandpa says. If you are        25, how old is Grandpa?

Accepted Answer

65. (90 − 25 = 65.)

Intresting Maths Riddles

1. Three friends split a bill of $30.
They each pay $10.
Later, the waiter realizes the bill was only $25, so he gives back $5.
They each take $1, and give $2 to the waiter as a tip.
So they each paid $9, totaling $27. Add the $2 tip → $29.
Where is the missing dollar?

2. The Disappearing Painting, A thief stole a painting from a museum with 24/7 security. No alarms went off. No one broke any locks. But the next morning, the painting was gone. Security footage shows no one entered or left. How was it stolen?

3. The Hat Trick You see five people in a line. Each wears a red or blue hat. They can only see the hats in front of them. Each is asked (from back to front): “What color is your hat?” The last person (who sees all 4 in front) always guesses right. How?

They use a pre-arranged parity strategy (e.g., say "red" if number of red hats is even).
It’s logic, not luck.

4. Add me to myself and multiply by 4. Divide me by 8 and you get me back. What number am I?

—Any number

5. If 3 cats catch 3 mice in 3 minutes, how long for 100 cats to catch 100 mice?

— 3 minutes

6. A stick is broken into 3 random pieces. What’s the chance they form a

triangle? — 1/4

7. How many times do the hour and minute hands overlap in 12 hours?

— 11 times

8. Multiply me by any other integer and the result is never prime.

0 or 1 (strictly: 0; 1×prime = prime, so answer: 0)

9. A pirate finds 10 gold coins and splits them evenly among 5 crew members, keeping none. How many coins per crew member?

Answer: 2. (10 ÷ 5 = 2.)

10. “If you add my age to yours, the total is 90,” Grandpa says. If you are 25, how old is Grandpa?

Answer: 65. (90 − 25 = 65.)

Loving our Riddles? check riddles on famous films

Loving our Riddles? check riddles only 1787 people have solved

Intresting Maths Riddles

1. Three friends split a bill of $30. They each pay $10. Later, the waiter realizes the bill was only $25, so he gives back $5. They each take $1, and give $2 to the waiter as a tip. So they each paid $9, totaling $27. Add the $2 tip → $29. Where is the missing dollar?

2. The Disappearing Painting, A thief stole a painting from a museum with 24/7 security. No alarms went off. No one broke any locks. But the next morning, the painting was gone. Security footage shows no one entered or left. How was it stolen?

3. The Hat Trick You see five people in a line. Each wears a red or blue hat. They can only see the hats in front of them. Each is asked (from back to front): “What color is your hat?” The last person (who sees all 4 in front) always guesses right. How?

They use a pre-arranged parity strategy (e.g., say "red" if number of red hats is even). It’s logic, not luck.

4. Add me to myself and multiply by 4. Divide me by 8 and you get me back. What number am I?

—Any number

5. If 3 cats catch 3 mice in 3 minutes, how long for 100 cats to catch 100 mice?

— 3 minutes

6. A stick is broken into 3 random pieces. What’s the chance they form a

triangle? — 1/4

7. How many times do the hour and minute hands overlap in 12 hours?

— 11 times

8. Multiply me by any other integer and the result is never prime.

0 or 1 (strictly: 0; 1×prime = prime, so answer: 0)

9. A pirate finds 10 gold coins and splits them evenly among 5 crew members, keeping none. How many coins per crew member?

Answer: 2. (10 ÷ 5 = 2.)

10. “If you add my age to yours, the total is 90,” Grandpa says. If you are 25, how old is Grandpa?

Answer: 65. (90 − 25 = 65.)

Loving our Riddles? check riddles on famous films

Loving our Riddles? check riddles only 1787 people have solved

1. Three friends split a bill of $30.
They each pay $10.
Later, the waiter realizes the bill was only $25, so he gives back $5.
They each take $1, and give $2 to the waiter as a tip.
So they each paid $9, totaling $27. Add the $2 tip → $29.
Where is the missing dollar?

They use a pre-arranged parity strategy (e.g., say "red" if number of red hats is even).
It’s logic, not luck.