What seven-letter word has hundreds of letters in it?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can you replace the question mark with the correct number in the below table sequence?

What is the largest number you can write with just 3 digits?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Which number comes next in the number series?

2, 9, 30, 93, ?

Solve the following series:
AZ, GT, MN, __, YB

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

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.