If the average life of a person is taken as 100 s the age of the universe on this scale is of the order

Age of universe is of the order of ………. Second.

Average age seven persons in a group is 30 years .The average age of five person of this group is 31 years .What is the average age of the other two person in the group ?

If the average human life span were of the order 10^4 s, what would the revolution period of earth on this scale be?

If the average human life span were of the order 10^4 s, what would the revolution period of earth on this scale be?

Five years ago, the average of the ages of 4 persons was 40 years. If a new person joins the group now, then the average of the ages all five persons is 46 years. The age of the fifth person (in years) is:

The average age of 8 persons is increased by 2 years, when one of them, whose age is 24 years is replaced by a new persons. The age of the new person is