Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

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?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Can you write down eight eights so that they add up to one thousand?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Which number comes next in the number series?

2, 9, 30, 93, ?

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 city is three-fifths chick two third cat and 50% goat?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?