Test Preparation on Mathematics Olympiad Class-7 Test Prep-4

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 9th 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

Which of the following statements is true?

Write the following statement in the form of an equation:
The sum of three times x and 10 is 13.