Can you find the odd number in the following?

2716, 4135, 5321 and 7145

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What does below rebus means ?

What is at the end of a rainbow?

What has one eye, but can’t see?

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?