With the help clues provided in the image, can you find the 5 digit key?

Can you write down eight eights so that they add up to one thousand?

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

Can you solve the rebus below?

Why 1729 is a magic number? Answer Logically.

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

I am quite hot but become too cold if you remove the first two letters. What am I?