Find the next number in the sequence

1, 2, 6, 21, 88, __?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What is both possible and impossible at the same time?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Which letter of the alphabet has the most water?

Which wheel of car does not rotate when you turn your car right?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

How can one talk without saying a single word?

I look at you, you look at me, I raise my right, you raise your left. What am I?

What kind of band never plays music?