Replace the question mark with the correct number.

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Which word does the below Plexor means ?

What kind of tree can you carry in your hand?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?