Which number should replace the question mark?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Can you count the number of squares in the given picture?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

A man dies of old age on his 25 birthday. How is this possible?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Bay of Bengal is in which state?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?