A and B can do a piece of work in 60 days and 40 days respectively. They started the work together but after some days, A left the work. B alone did the remaining work in 20 days. Find after how many days A left the work.

The owner of a general store charges 25% more than the cost price of sugar. If a customer paid Rs 67.50 for two kg sugar then what is the cost price of sugar per kg ?

The population of a town increases by 15% in the first year and decreases by 25% in the second year. If its current population is 168480 then what will be its population after two years ?

The area of a rectangle is five times the area of a square.The length of the rectangle is 400 ft and breadth is 1/4 of the side of the square. What is the side of the square ?

A farm owner has some hens and some goats. If the total number of animal heads is 72 and the total number of feet is 232, what is the difference between the total number of goats and the total number of hens in the farm ?

Salary of B is 18% more than the salary of A and salary of C is 20% more than the salary of B. What is the total salary of A, B and C if the salary of ' B ' is ?18880 ?