What word is pronounced the same if you take away four of its five letters?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

You have 1023 apples and 10 bags. You have to distribute these apples in these 10 bags in any way you choose. But when I ask for a certain number of apples you have to give them in terms of bags without transferring the apples from other bags. How do you distribute the apples?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?