Can you solve this picture maths equation?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What English word has three consecutive double letters?

Keyboard words are not in alphabetical order, Why?

Which number should replace the question mark?

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

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?