Why was the detective’s wife furious when he arrived home at **9**:30 when he said he’d arrive home at **9**:30?

Two trains enter a one-way tunnel at different ends exactly at **9**:00, But they both come out the other end unharmed 5 minutes later. How is this possible?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/**9** of **9**/10 of 1000?

A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?

Paul's height is six feet, he's an assistant at a butcher's shop, and wears size **9** shoes. What does he weigh?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

A man was found dead while on his work trip abroad. The suspects were his colleagues Mason, Bob, Lisa, and Alex. On the calendar, 3, 4, **9**, 10, 11 were written in blood. How should the detectives decode the numbers to find the killer?

You have a 4 minute sand clock and a 7 minute sand clock, you need to measure **9** minutes while using both of them. What's your first move?
(The 'Google Riddles' are interview questions those who wish to get hired were asked).

Ben has math lessons 4 times a week. If he has math 8:00 Monday, **9**:20 on Tuesday, 10:40 on Wednesday, and 1:20 on Friday, when does Ben have math on Thursday?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation.
Conditions: Each must be used exactly once and no other numbers or symbols can be used.

How many pluses should we put between the digits of 987,654,321 to get a total of 99, and where?

If you have two twins, three triplets and four quadruplets, how many people do you have?

There is a creature which could double its size every day. So, if the creature is put in a tank then it will fill the tank in 10 days.
How many days would it take for the creature to fill a half and how many days to fill a quarter of the tank?

A man has three daughters. A second, intelligent man, asked him the ages of his daughters. The first man told him that the product of their ages (them all multiplied together,) was 36. After thinking the second man was unable to find the answer and asked for another clue. The first man replies the sum of their ages is equal to his house door number. Still the second man was unable to answer and asked for another clue. The first man told him that his youngest daughter had blue eyes, and suddenly second man gave the correct answer. What were the ages of the first man's 3 children?

If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?

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