Spot 5 differences in two Christmas tree below:

What 5-letter word typed in all capital letters can be read the same upside down?

The answer I give is yes, but what I mean is no. What was the question?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

You can hear me, but you can't touch or see me.

What am I?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

How can you leave a room with two legs and return with six legs?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?