Which alphabet letter is a question?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

What number divided by 4 is the same as that number minus 4?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Consider this about a word: 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?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?