Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

How many letters are in the alphabet?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?