Test Preparation on Mathematics Olympiad Class-6 paper-2

In the following series, how many 2’s are there which are followed by 3?
4 6 2 5 7 8 3 2 3 6 4 5 3 8 2 7 2 3 8 9 2 3 6 2 5 7 8 2 4 3 1 4 2

If the 9^th day of a month is 4 days earlier than Wednesday, what will be 20th day of the month?

My mother is three times older than my sister. My father is 30 years elder to me. I was five years old when my sister born. If the present age of my sister is 15 years, then the difference of my parents’ age is

The greatest of the numbers 123, 27, 650, 2342, 40000 is

Which of the following numbers is not a factor of 68?