Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What Deficiency does the below rebus represent?

VIT_MIN

What month of the year has 28 days?

There is something which you can be arrested for attempting but not for successfully completing.

How many triangles are there in the picture below?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What's the only room from which no one can enter or leave