Why Aeroplane windows are round?

With the help clues provided in the image, can you find the 5 digit key?

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

18 ? 12 ? 4 ? 5 = 59

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

I have Rs.50 and I spend it in the way as below.

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

81 x 9 = 801. What must you do to make the this equation true?

What does this below rebus puzzle mean?

What is wrong in the below Picture?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?