If the population of country double in 50 years, in how many years will it triple under the assumption that the rate of increase is proportional to the number of inhabitants.

If the population of a country doubles in 60 years , in how many years will it be triple (treble) under the assumption that the rate of increase is proportional to the number of inhabitants ?

The population of city doubles in 80 years , in how many year will it be triple when the rate of increase is proportional to the number of inhabitants.

A sum of money doubles itself in 10 yr. In how many years would it triple itself?

A sum of money becomes doubles in 10 year In how many years it will be 3 times at the same rate of simple interest ?

A sum of money (P) doubles in 10 years . In how many years is will treble at the same rate of simple interest ?

An amount get tripled in 3 years.In how many years it will get 243 xx.

If a certain sum at compound interest becomes double in 5 yr, then in how many years, it will be 16 times at the same rate of interest ?

A certain sum of money triple itself in 8 years. In how many years it will be five times?