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?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

Which five letter word can be added at the end of below word to form a
valid word?

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Which digit occurred maximum times between the number 1 and 1000?

You need to arrange three 7 and mathematical symbols to form number 1?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Can you move 2 matchsticks to form four equal sized squares.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?