Replace the question mark with the correct number in the below-given picture?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Which country gets ill every time?

What does Alexander the Great and Winnie the Pooh have in common?

Why 1729 is a magic number? Answer Logically.

O_er_t_o_

Complete the missing letters of the given word.

Replace the question mark with the correct number in below Picture:

A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

The taxes were to be paid in the form of grains. Everyone must pay pounds of grain equaling his respective age. This means a 20-year-old will have to pay 20 pounds of grain and a 30-year-old will pay 30 pounds of grain and so on.

The chief who collects the tax has 7 weights and a large 2-pan scale to weigh. But there is another custom that the chief can weigh only three of the seven weights.

Can you find out the weights of the seven weights? Also, what is the maximum age of the man that can be weighed for the payment of taxes?

Can you identify the Oscar-winning movie from the rebus below?

What runs around the whole yard without moving?