Following the same logic, crack this mathematical puzzle ?

 

A food chain is the only chain we can eat.

It was Mount Everest. It was not discovered yet but it was the highest mountain on the Earth.

A Joke is what you can crack, make, play and tell.

Bookkeeper is the only English word that has three consecutive double letters.

A Kitten.

KIWI is a bird, a fruit and a person from New Zealand are called as KIWI's.

394  is the code to unlock the key.

If you take the second statement, 7 is incorrect from the first statement and 1 is incorrect from the fourth statement. Hence 4 is correct, but not on the second place. From the third statement, 4 is not on the first place. Hence 4 is on the third place.

From the fifth statement either 6 or 9 is correct. But combining it with the third statement, 6 is incorrect. Hence along with the first statement, 9 is correct and on the second place.

From the third statement, 3 is correct and on the remaining first place.

I am a Window, allows people to see through walls.