Can you solve the below tricky visual equation?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What does the below rebus puzzle mean?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Intelligence Agency need to break the vault but the problem is that they are not able to break the vault.

On the vault, a text is written as:

31 11 33 33 43 45
21 25
31 24 11 31 51 41

To Break the code Intelligence Agency brings a mathematician named Joseph.
Minutes later he deciphers the code.

Whats the code?

Before Mount Everest was discovered, what was the highest mountain in the world?

How many times can you subtract the number two from the number fifty?