When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I have feet, but no legs. Which animal Am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Which country gets ill every time?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Find the number of squares in the below-given picture.