Solution:

Just One!

example
If u get Blue rock with label as "blue+red" => this is red as all labels are wrong.
In this way u can logically solve this puzzle.

Solution:

Hockey Stick $49.50 & ball $0.50

Solution:

If you ask the guard who always tells the truth, he would tell you the other guard would point you to the door of death. If you ask the guard who always lies, he would tell you the opposite door of the truth-telling guard and point you to the door of death. In either case, both guards will point to the door of death so you should choose the other one.

Solution:

Isaac Newton picks up a piece of wood and lights it from the fire on the west end of the island.

He then quickly carries it near the east end of he island and starts a new fire. The wind will cause that fire to burn out the eastern end and he can then shelter in the burnt area.

(Funny Part : Isaac Newton survives the fire, but dies of starvation, with all the food in the forest burnt )

Solution:

10

38 Sheeps = 30 ate sheeps (30 ate sounds like 38)
There's 40 Lions in a field, 30 ate Sheeps

So if you do simple maths 40 - 30 = 10
the answer is 10

Solution:

"Six" (6)

When you remove the first letter "S" from the word "Six," you are left with the letters "Ix."

"Ix" is the Roman numeral representation of the number 9.

Thus, the wordplay involves the transformation of "Six" (6) into "Ix," representing the number 9, which is an odd number in Roman numerals.

Solution:

24 Years

If you were 8 years old 8 years ago, then your current age is 8 + 8 = 16 years old.
After 8 more years pass, your age will be 16 + 8 = 24 years old.

So, you will be 24 years old in 8 years from now.

Solution:

A SINGLE WORD.

Solution:

11

You already knew the answer wasn't 26 letters. That would be too easy.
The letters in the words "the alphabet are 11

Solution:

Chilwell can go through as all the person whose name contains even number of letters can go through the door.

This is a classic green glass door riddle.