Today the whole world is the same age. Today is a very special day. It happens only once after every 1,000 year.

Your age + your year of birth, every person is =2018 .
Why is this happening??

Q. The average age of a family of 6 members 4 years ago was 25 years. Meanwhile a child was born in this family and still the average age of the whole family is same today. The present age of child is ......

Q. After 20 years, Aditya’s age will be three times his age today. What will be his age after 30 years from today?

Q. Four years ago, the average age of a family of four persons was $18$ years. During this period, a baby was born. Today if the average age of the family is still $18$ years, the age of the baby is

Q. Shubham's age today is $12$ years and his father's age is $42$ years. Shubham's mother is younger than his father by $6$ years. Find the following ratios.
(1) Ratio of Shubham's age today to his mother's age today.
(2) Ratio of Shubham's mother age today to his father's age today.
(3) The ratio of Shubham's age to his mother's age when Shubham was $10$ years old.

Q. Sarita plays guitar every Monday and piano every 3rd day. If today is Monday and she played both the instruments, after how many days will she next play both the instruments on the same day?​