Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Which is faster, Heat or Cold ? Explain.