A bag contains 18 twenty-paise coins, 27 fifty-paise coins, 12 one-rupee coins, 16 two-rupees coins and 7 five-rupee coins. Find the total amount in the bag.

The population of a city is 18,60,000. It increases by 15% in the first year and decrease by 18% in the second year. Find the population of the city at the end of the two years.

A boat running downstram covers 88 km in 5.5 hours while to cover the same distance upstream it takes 14 2/3 hours. What is the speed of the boat in still water ?

In an examination 45% of the aggregate marks is required to pass. A student scores 310 marks and is declared failed by 41 marks. What is the maximum aggregate marks ?

Two persons A and B can complete a piece of work in 24 days, while A alone can do the same piece of work in 40 days. In how many days can B alone finish the work ?