What four weights can be used to balance from 1 to 30 pounds?

You need to move three matchsticks to form three squares. Can you do it?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

You see me once in June, twice in November, and not at all in May. What am I?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.