Can you find the odd number in the following?

2716, 4135, 5321 and 7145

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

Which letter of the alphabet has the most water?

How many times do a clock's hands overlap in a day ?

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

What kind of band never plays music?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

What do you get if you add 2 to 100 four times?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?