Can you replace the question mark with the correct number?

Find the smallest sentence with all the English alphabet.

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

I can write cow in 13 letters.

Can You?

A blonde put eyeliner on her head. Why?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you find the mistake in the below statement?