Can you find the odd number in the following?

2716, 4135, 5321 and 7145

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

Can you count the number of lines in the below picture?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

If 21x = 79x, what is the value of x?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

The more you take me, the more you leave me behind.
Who Am I?