I have teeth but i don't bite. Who Am I ?

what does the below math rebus puzzle mean?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

If your uncle’s sister is not your aunt, what relation is she to you?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Which alphabet letter is a question?

In the image below, can you find the value of an angle(y)

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?