Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

What four weights can be used to balance from 1 to 30 pounds?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Move four matchsticks to the below square to form three squares?