Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

I have feet, but no legs. Which animal Am I?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

Complete the table series riddle by finding the number that can replace "??".

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Can you find out the missing number in the grid?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?