A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Replace the question mark in the picture below.

What makes this number unique: 8,549,176,320?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What does this below rebus puzzle mean?

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

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?