Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What occurs twice in a week, once in a year but never in a day?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

What number divided by 4 is the same as that number minus 4?

Replace the question mark with the correct number in below Picture:

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Can you decipher the two rows to find the hidden word?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?