Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Find the number of squares in the below-given picture.

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?

What has 88 keys?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Can you decipher the below rebus?

PBLUESAISNUERSES

Here is a mathematical expression that also secretly tells a movie name. What movie is that?