Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Which alphabet letter is a question?

I drive at an average speed of 30 miles per hour to the railroad station each morning and catch my train. On a particular morning, there was a lot of traffic and at the halfway point, I had averaged only 15 miles per hour. How fast must I drive for the rest of the way to catch my train?

A couple went on a climbing trip. But only the husband returned from the vacation and said that his wife slipped off while climbing and died. On investigating, the local sheriff arrested him saying, 'Your travel agent called. You murdered your wife.'

The man did not inform anyone about the trip. Then how was the agent so sure that it was a murder?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Prove that twice of ten is the same as twice of eleven.

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.