Can you find out which number multiplied by itself will give the output as 12345678987654321?

Which tank will fill first?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you solve the below geography rebus by decoding the below rebus ?

What month of the year has 28 days?

What does this mathematical rebus means ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

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.

Can you count the number of squares in the given picture?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59