Can you replace the question mark with the correct number?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

One night, Louis and Adam were sitting together. Adam was watching a movie while his wife Louis was reading a mystery book. Suddenly the power went out and Adam decided to go to bed, but strangely Louis kept on reading. There was no artificial light around, so Louis kept on reading. How come?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

How many letters are in the alphabet?