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

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

There is a square piece of paper with a hole that is denoted by the circle on the top right side in the given picture. You have to cut the paper in a manner that it forms two and only two separate pieces of paper and then rearrange the pieces in a manner that the holes come in the centre of the paper.

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

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?