Can you find the odd number in the following?

2716, 4135, 5321 and 7145

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?

Which is heavier: a ton of bricks or a ton of feathers?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

You bought me for dinner but never eat me. What am I?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

What has a ring but no finger?