How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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

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