When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

How can you take 2 from 5 and leave 4?

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

Spot what is wrong here in below Picture?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

How can a man go eight days without sleep?

I can be cracked, made, told, and played. What am I?

Can you decipher the two rows to find the hidden word?

What does this rebus mean?

O
N
C
E
TIME