Can you find the odd number in the following?

2716, 4135, 5321 and 7145

How many letters are in the alphabet?

What has many keys but can’t open a single lock?

There was a strange boy who was born before his father. How can this be possible?

Which Burger Is Different in below image?

A woman who works in a sweet shop has a measurement of 32-26-36, is 5"4" tall, and wears size "6" shoes. What do you think she weighs?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

Which Travels Faster? Solve below famous picture riddle:

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?