Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

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?

Which tank will fill first?

Why is the Hole below a Lock?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.