If it took eight men ten hours to build a wall, how long would it take four men to build it?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

How do you go from 98 to 720 using just one letter?

What do you call a fish without an eye?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

It has horns but can’t beep. It is like to bleat but It is not a sheep. What 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.