Radium decomposes at the rate proportional to the amount present at any time.
If p percent of amount disappears in one year, what percent of amount
of radium will be left after 2 years?

An ice ball melts at the rate proportional to the amount of ice at any instant. If (2/3)rd quantity melts in 2 hours and if initially quantity of ice is n_0 , find the amount left after 6 hours.

The population of a town increases at a rate proportional to the population at that time . If the population increases from 40 thousands to 60 thousands in 40 years, What will be the population in another 20 years ? = [ Given: sqrt(3/2) = 1.2247 ]

What will be the amount on ₹ 500 at 8 p.c.p.a. after 2 years ?

The decay rate of certain substance is directly proportional to the amount present at that instant.Initially there are 27 grams of substance and 3 hours later it is found that 8 grams left.The amount left after one more hour is……….

A cistern is being emptied in such a way that the rate at which water is flowing out is proportional to the amount left at that instant. If half the amount flow in 7 minutes, after how much time 1/8 th of the water will be left? a)14 minutes b)21 minutes c)28minutes d)35 minutes

The rate of decay of certain substance is directly proportional to the amount present at that instant.Initially,there are 27 gms of certain substance and three hours later it is found that 8 gms are left.Find the amount left after one more hour.