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?

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

What is the centre of gravity?

Can you count the number of quadrilaterals in the picture below?

What has many keys but can’t open a single lock?

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?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

What is in seasons, seconds, centuries and minutes but not in decades, years or days?