I am an odd number. Take away a letter and I become even. What number am I?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

You need to arrange three 7 and mathematical symbols to form number 1?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

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?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

A Shopkeeper sold a few chickens to four different customers on a particular day. It was such that each customer purchased half of the remaining chickens and half the chicken more.

Can you find out how many chicken were sold by the shopkeeper on that day if we tell you that the fourth customer bought a single chicken ?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?