What number when divided in half becomes zero?

Replace the question mark with the number below given a simple math problem.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Count the number of squares in the picture below.

What question can you never answer yes to?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?